Revision history for Graph::Easy (formerly known as Graph::Simple):

2006-01-08 v0.39 Tels 1603 tests
  * Graph: fix merge_nodes() to delete node B from group if part of one
  * fix Group:
    + del_edge(): delete edge on id, not non-existant name
    + del_node() & del_member(): drop all edges mentioning the node
    + optimize edges() and nodes() in scalar context
  * Graph: improve handling of "|" in attributes (especially labels)
  * Graph: del_node() and del_edge() also remove these from their group
  * Edge: 
    + add start_at(), start_port(), end_port()
    + fix POD start
  * Node: add nodes_sharing_start(), shared_edges(), has_predecessors()
  * add source_nodes() and predecessorless_nodes() (Thanx to Florian Lindner
     for the suggestion!)
  * as_html(): add "white-space: pre" to the CSS to prevent wrapping of
	       labels with spaces in them
  * as_graphviz():
    + implement edge joints (shared start/end port) via invisible joints
    + handle attributes like labels with embedded newlines
    + output edges from/to groups (subgraphs/clusters)
  * Layouter:
    + allow sharing of end ports (making edges join up on the way
      to the target node)
    + min distance between node is 3, not 2, when there are edges
      that share an start/end point (to make room for the joints)
    + Layouter: place nodes with a shared start point in the same column/row
      than the others (to render tree-like layouts automatically)
  * multiple attributes for autosplit nodes were broken, when:
    + the attribute did not have a strict check (link, f.i.)
    + there was a newline after the node ala "[A|B]\n { fill: red|green;}
    + the attribute did have a fixed list of words (like "shape")
    (Due to Ron Newmann's question I stumbled over these bugs - thanx!
  * add support for "shape: img;" (Thanx to Ron Newmann for the suggestion!)
    + as_html: use "<img...>" 
    + as_graphviz: use "<<TABLE .. <IMG...>>" 

2006-01-01 v0.38 Tels 1571 tests
  * include the missing 4_flow.txt test files
  * Group.pm: fix POD
  * Parser: attributes on nodes in a node list apply to all nodes in the list
	    up to this point. So:
	[ Bonn ] { color: blue; }, [ Berlin ] { fill: black; }
	    will fill both nodes black, but only color "Bonn" blue.
  * remove unused arrow-code on hor-selfloops
  * as_ascii: draw bidirectional self-loops with two arrows (Thanx Dan Horne!)
  * Layout: fix bidirectional edges created by A* (multi-celled nodes) and
	    the straigh-path shortcut (more than one cell distance)
	    (Thanx to Dan Horne again)
  * Layout: ignore links from/to groups, do them after splicing in group
	    filler cells
  * Attributes: remove direction() and add:
    + _direction_as_number()
    + _flow_as_number()    
    + _flow_as_side()    
    + _direction_as_side()    
  * Graph: remove the unused and wrong angle() method
  * Graph: allow add_edge('Node', 'Node2', 'edge label');
  * Edge: add flow() and port()
  * Node: add flow(), angle()
  * check POD coverage of Graph::Easy::Attributes and As_ascii
  * fix the flow model:
      correctly handle absolut (south/180/east/90/down etc) and relative
      (left/right/front/forward/back), as well as global and local flow
      on a per node/edge basis
  * as_txt(): output the original flow/start/end attribute instead of
	      a converted value ('down' vs 180, 'left' vs XX)
  * Base: add _croak() method
  * Node: growing nodes with edge end/start point restrictions did make
	  the node one to big on each restricted side
  * use constant instead of home-grown "sub CONSTANT() { 1; }"
  * as_graphviz(): output correctly nodes in a group w/o attributes and edges
  * as_graphviz(): support correctly most node border and edge styles,
		   even in combination with fillcolor. Thanx to Ryan Schmidt!

2005-12-27 v0.37 Tels 1533 tests - Sing, sing, sing the birthday song...
  * correctly handle '\\n' in labels/titles
  * Node::Cell: allow 'x' and 'y' as arguments
  * Layout: repair split multi-celled nodes after inserting group fillers
  * Layout: insert short filler edge pieces on spliced edge for
	    group layouts (fixes "holes" at the start and end of edges
	    in ascii layouts with groups)
  * Layout: set smaller minimum-size for group cells at non-corners
  * Layout: grow group fillers to close gaps between nodes in things like:
	    "( Group: [ A ] [ B ] )"
  * Parser: handle "([A]->[B])" (allow empty group name)
  * Parser: don't set group name of '0' to ''
  * Parser: handle "] -> ( ..." (edge from node to group)
  * Parser: handle ") -> ( ..." (edge from group to group)
  * Parser: "...) -> [ A ]" is a group-to-node edge, not node to node
  * add attribute "flow" for edges (per-edge flow)

2005-12-18 v0.36 Tels 1516 tests
  * Parser: add support for node lists on the right-hand side:
    [ Bonn ], [ Berlin ] -> [ Potsdam ], [ Halle ]
  * allow "inherit" for colors
  * Node: fix edges_at_port() to skip edges not starting/ending here
  * Group: fix add_member() and del_member() for edges
  * Group: fix add_node()
  * Node: fix background()
  * Graph: fix default fill for groups in HTML
  * Graph: add_group(): return $group, not $self
  * Layouter:
     + stop chain-tracker at nodes that are grandchildren of the current node
     + grow nodes based on used/free ports (fixes shared ports)
     + grow nodes only in one direction if they have 'rows' or 'columns'
     + shuffle self-loop directions according to graph/node flow
     + A*: no longer cross edges along their flow line (leading to corrupted
	   layouts with multiple crossings in a row)
     + convert edge joiners to joints for shared edges
  * render joints in as_ascii, as_boxart and as_html
  * as_ascii: render no arrows on undirected edges (esp. for selfloops, corners
	      and cross sections)
  * as_html: fix edge color if only "label-color" is set
  * as_html: fix self-loop on east side
  * as_html: render no arrows for undirected edges
  * as_graphviz: output headport/tailport for edges with "start" or "end"
		 (this doesn't seem to work in "dot" at all, sadly :-(
  * as_graphviz: output groups as clusters (subgraphs)
  * do multiple edges from A to B,C,D etc in the order of "B,C,D" instead
    of pseudo-random order

2005-12-10 v0.35 Tels 1483 tests
  * Node: fix parent()
  * allow "$graph->add_group('Name');"
  * render group labels
  * close edge gaps created by inserting group filler cells
  * group label font-size defaults to 0.8
  * fix doc about default font-size (0.8 for edge/group labels, not 0.75)
  * as_html: fix borders of groups without a special class/border
  * as_html: fix content and background of nodes with "shape: point;"
  * as_html: fix group backgrounds (especially with edges and class/non-class
	     attributes)
  * as_html: don't need to put text/font attributes on empty (group) cells
  * as_html: fix shapes like "circle" on nodes with a link
  * remove relicts of old group handling code in Nodes/Group Cells
  * use more isa() instead of ref() checks for class names 
  * "class { label: ...; }" was ignored and did not change the label
  * allow: "start: south , 1;" (space before ",")
  * add directions "left", "right", "front" and "back for "start"/"end"
    (these are flow-dependend, unlike "south" etc)
  * add attribute 'autotitle: link;'
  * add attribute 'autolabel: name;' and "autolabel: name, N;"
  * make "autotitle: none;" work
  * document and test that "autotitle: name" on edges will fall back to
    the edge label
  * document and test that a present title will override "autotitle"
  * implement edge-joints:
    + A* will use edges for start cells if they share the same port

2005-12-04 v0.34 Tels 1437 tests
  * as_html: align arrow heads better with the edge line
	     (still breaks sometimes, espc. with edge labels)
  * as_html: implement missing edge corner piece E->S
  * as_html: implement selfloop edge pieces
  * as_html: fix crossings of different edge styles
  * as_html: putting a "fill" or "border" on an node with a link did put
	     these styles on the link, not on the table cell.
  * as_ascii()/as_boxart(): render group borders
  * as_graphviz(): fix arrows on undirected/bidirectional edges
  * A*: compute the working space and disregard cells outside this area
	This prevents the run-away situation in case no path can be found.
  * A*: did not close crossings on edges, getting it stuck in an add-del-add
	cycle until it hit the hard limit of 10000 steps, thus never finding
	the path.
  * A*: find less bendy paths (no inward bend corners anymore)
  * fix a bug in trying placements of nodes, where the node would be
    registered on all potential places, instead of only the final selected
    one. In HTML, the node would thus appear multiple times in the output.
  * Graph: streamline sorted_nodes();
  * Edge: keep edge cells in sorted order (from start to end), and allow 
	  add_cell() to insert a cell into the list (to repair edge-splitting
	  from the group-padding code). Also allows rendering cells in order.
  * Edge: has_ports(): return true if start or ending port of the edge are
	  restricted in some way (attributes 'start' and 'end')
  * Nodes relative to multi-celled nodes did not take into account the size
    of the origin node (when the offset was positive in X and/or Y dir.).
  * add Graph:Easy::Base as base class for common code for all objects
  * add Graph:Easy::Layout::Chain for internal use in the Layouter
  * completely rewrite the chain-tracking code, and the code that generates
    layouts based on the chain info. Handles now bidirectional edges,
    forwad/backward loops and is generally more robust.
  * Layouter: grow nodes by 2 in each direction, instead of 1. This fixes
	      layouts with star-shaped auto-grown multi-celled nodes (try to
	      say this three times fast...) where you have on node at
	      the center. Since nodes are never placed next to each other,
	      growing the node by 1 did not make enough space for all adjacent
	      nodes.	
  * use diag() instead of printing to STDERR in tests
  * edge crossings with a start/end point had the type check wrong and
    thus could lead to the styles being switched around (HOR vs. VER)
  * Graph: add svg_information()
  * add attribute "basename" to autosplit nodes to make referencing easier
  * add edge attributes: 'start' and 'end' - node starting/ending port to
     specific node ports for specific layouts
  * create Empty nodes for autosplit nodes again (regression)
  * trailing/leading empty parts on autosplit nodes are always removed, so
    "[ |A|B| ]" equals [ A|B ]
  * move _prepare_grid() to Graph::Easy::Layout::Grid and load it on demand
  * autosplit nodes only get an unique ID when their basename doesn't already
    exist, so this now works:

	[ A|B ] { basename: one; } [ C|D ] { basename: two; }
	[ one.1 ] -> [ two.0 ]

2005-11-13 v0.33 Tels 1337 tests
  * simplify group code: Nodes can only be in one group at a time
  * Groups: edges with their to/from nodes in the same group are also
	    added to that group
  * as_html: put correct group class on edge cells, so that they
	     inherit the background from the group  
  * as_html: if nec., output CSS for anon nodes
  * as_html: implement missing corner pieces (W->S, S->W etc)
  * as_graphviz: use "setlinewidth()" to simulate bold, broad and wide borders
  * Node: add size()
  * add a few more examples to the attributes in the doc (for manual)
  * A*: for each start point: calculate distance to each stop point and use
        the lowest one. Fixes tricky layouts with multi-celled nodes.
  * Layouter: implement direction shuffling for multi-celled nodes
  * Layouter: fix code calculating edge end/start points to handle corners
  * update the check for As_svg's VERSION in Makefile.PL
  * Easy.pm: don't needlessy import non-existing GROUP_MAX (Thanx to PPI!)
  * Layouter bugfixes:
    + paths with one bend did not check the corner-cell for being already
      occupied, leading to obscuring nodes/edges on that place
    + failing to find a bend path horizontal->vertical, the code tried
      next vertical->horizontal, but did not remove the already tested
      parts, leading to stray edges pieces (poss. obscuring other parts)
  * defining an "offset" and "origin" on an autosplit node caused an endless
    loop in the layouter:
    [ 1 ] --> [ 2|3 ] { origin: 1; offset: 2,3; }
  * Layouter: autosplit nodes w/o edges, and chained nodes caused endless
    loops when placing them. Examples that did hang the layouter:
    + "[1]->[2] [3|4]"
    + "[1]->[2] [3] [4] { origin: 3; offset: 1,0; }"
    + "[1]->[2] [3|4|5]"
  * Parser: referencing a part of an autosplit node before the autosplit node
	    did result in endless loops or crashes. "[1] -> [23.0] [2|3]"
	    works now correctly.
  * Parser: accept "size: 1, 2;" as valid (spaces around ",")
  * Parser: "[1],[2] --> [3]" should result in two edges to [3] (from 1 AND 2)
  * as_txt: "size: X,Y" did make columns and rows appear swapped in output
  * as_txt: output "size 1,2;" instead of "rows: 2; columns: 1;", except when
	    only rows is defined
  * as_txt: quote special chars [";%\x00-\x1f] in attributes on output
  * Graph: added as_boxart_html_file(), _border_attributes_as_html(),
	   anon_nodes()
  * Graph: rename border_attributes() to split_border_attributes()
  * added Edge styles: "broad" (0.5em), "wide" (1em), "bold-dash"
  * added Node border-styles: "broad", "wide" and "bold-dash"
  * better support for border-styles in HTML
  * support borders on anon nodes ala "[ ] { border-style: dotted; }"
  * Nodes with "shape: invisible;" are at least 3 chars wide (was: 5)
  * use Carp::confess() instead of Carp::croak() to aid debugging
  * setting "{ border: broad red; }" will set the style ("broad") and color
    ("red"), but leave the width alone
  * use isa('Graph::Easy::...') instead ref() to check for Node/Edge 
  * Edge::Cell: add arrow_count()

2005-11-06 v0.32 Tels 1291 tests
  * as_boxart():
    + use "v" and "^" instead of 0x2227 and 0x2228 for arrows
      (because most fonts seem to not have these characters)
    + border/edge styles "dot-dash" & "dot-dot-dash" use midot instead of "."
    + fix horizontal pieces of dot-dash borders
  * as_ascii()/as_boxart():
    + align point-shaped nodes with edge lines
    + edge-pieces with style "dot-dot-dash" must be at least 6 characters
      wide to properly show the full "..-" style
  * as_graphviz(): fix handling of special characters like [;"] in attributes
  * Parser: accept "offset: 1, 2" (space around ",") as valid
  * Graph: prevent adding of Nodes with no name
  * Graph: can add nodes with name '0'
  * Graph: added del_node(), del_edge(), merge_nodes()
  * Graph: edge(X,Y) returns list of all edges from X to Y in list context
  * Node: add incoming(), outgoing()
  * Node/Edge: setting an attribute resets the size cache to force a re-calc
               (the node should grow/shrink when you change the label)
  * fix an undef warning in Edge/Cell line 713
  * streamline printfb_line() and use it whenever possible
  * Node: more rebust detection of class in set_attribute (no longer depends
	  on blessed class name)  
  * Node: add attribute "rotate"
  * preserve cell sizes after as_ascii()/as_boxart() for next call
    (multiple calls to as_ascii()/as_boxart() in a row did grow node-heights
     by 3 every iteration)
 
2005-10-30 v0.31 Tels 1171 tests
  * require at least Perl 5.8.0 (we need proper Unicode support)
  * Edge.pm: remove unnec. _formatted_label()
  * fix examples in t/fun and t/syntax
  * include newline before first =head1 (Thanx to Ivan Tubert-Brohman!)
  * fix package name in As_ascii.pm
  * As_ascii: add _u8() (for box-art)
  * add: as_boxart(), as_boxart_file(), as_boxart_html()
  * add examples/as_boxart
  * examples/as_*: input utf8 from STDIN
  * Parser: do a binmode ':utf8' on input files
  * support "graph { output: boxart; }"
  * add some X<> keywords for POD indexing
  * Graph: you can call get_attribute('attribute'), too (the class is now
    optional and defaults to 'graph' if missing)
  * Graph: you can do set_attribute('attribute','value'), too.
  * added attributes:
    + edgeclass for groups
    + font-size for graphs, groups, nodes and edges
    + text-style for graphs, groups, nodes and edges
    + arrow-style: none for edges
  * clarify that "label-color" falls back to "color" if unspecified
  * setting "edge { style: X; }" changes the style for all solid edges to X
  * Node: add parent() - return parent object (group or graph)
  * Parser: throw correct error message for unknown attribute names
  * horizontal straight, non-short edges were missing their arrows
  * as_txt(): fix output of undirected edges (" -- " vs. " -- <")
  * as_txt(): "origin" and "offset" attributes were missing in output
  * handle a label of "0" correctly
  * as_html(): render edge cross sections with the correct styles and colors
  * as_html(): do not output invalid CSS definitions for edges (style, label
	       link, title etc)
  * as_html(): setting a color on a node with a link works correctly now
  * as_html(): 'autolink' and 'link' on edges correctly create links
  * as_html(): 'title' on edges inserts a mouse-over title on the edge label
  * as_html(): remove trailing empty <tr></tr> pairs
  * as_html(): put the "empty-cells" definition inside table.graph
  * as_html(): create links on graph label (caption) if requested
  * as_html(): include the graph label into the table, this looks more
		consistent than the <caption>, which placed it floating above
		or below the graph
  * as_html(): repaired the output of group cells (see t/fun/0131.txt)
  * as_ascii(): do not draw border for nodes with "shape: none;"
  * as_graphviz(): nodes with shape none work now correctly
  * as_graphviz(): color of edge labels falls back to edge color if no
		   label-color is specified (was formerly rendered black)
  * _css_styles(): inplement $overlay support (add custom attributes) and
                   skip the border-attribute generation if it matches $skip
		   (both fixes are mainly for SVG output)
  * setting attributes on Edges/Nodes/Groups invalidates a former layout

2005-09-23 v0.30 Tels 1114 tests - Draw, draw, draw, draw the corners...
  * ascii.t could fail on very slow machines
  * fix pod/t. and pod_cov.t when the Pod::Test modules are not installed
  * fix as_ascii_html() to end with "</pre>"
  * as_html(): do not combine non-empty cells

2005-09-18 v0.29 Tels 1113 tests - Draw, draw, draw, draw the corners...
  * add attribute "label-pos" to class "graph"
  * remove only quotation marks in attributes when they are both at the start
    and end of the text. So "label: 2';" will work correctly now.
  * as_html(): work-around for IE not displaying edge corner pieces
  * as_html(): put caption below graph if label-pos: bottom
  * as_html(): use remap_attributes()
  * as_html(): correctly output nodes with "shape: none;"
  * as_html(): encode ' in links to %27
  * as_html(): do not combine cells with a set border (this produces incorrect
	       output)
  * as_html_file(): set correct document charset, and <title> tag
  * as_ascii(): output graph label, below or above, according to label-pos
  * as_graphviz(): remap border-styles, add support for border-style: double 
  * as_graphviz(): handle attributes in node, edge and group classes, too
  * as_graphviz(): handle graph attributes: label-pos, label
  * as_graphviz(): skip over graph attributes: gid, autolink etc
  * as_graphviz(): fix output of groups
  * as_graphviz(): fix output of graph border and style: none
  * as_txt(): do not list nodes twice in output of groups with 'nodeclass'
  * Graph: set_attributes() also goes via set_attribute(), e.g. properly
           checking arguments, handling "gid", decomposing "border" into
	   border-(style|color|width) etc.
  * default background attribute is ''
  * drop node shapes:
      egg (looks ugly, and impossible to support except in graphviz and SVG)
      doubleoctagon (already done by "shape: octagon; border-style: double")
  * optimize Graph::Easy::Group::Cell::_set_type, makes complex layouts with
    groups about 10% faster overall
  * remove unnec. routines in Graph::Easy::Group::Cell
  * streamline $graph->groups() in list context
  * Layout: Nodes are not placed next to each other (unless offset: is set)
  * Layout: consider HOR and VER edge pieces running alongside a node as
            potential start fields with penalty
  * Edge/Cell: export EDGE_NO_M_MASK
  * Node: add backgroud() routine that finds out the real background (for
    groups etc)
  * add POD tests via Test::POD (t/pod.t)
  * add POD coverage tests via Test::POD::Coverage (t/pod_cov.t)
  * 100% POD coverage for Nodes, Groups, Edges and Graph::Easy
  * move build/ dir to Graph::Easy::Manual

2005-09-05 v0.28 Tels 1058 tests - Offset, offset, offset, offset the position...
  * fix LIMITATIONS section in POD
  * fix POD in Graph::Easy::Attributes
  * fix testsuite to match reality
  * as_html(): fix output for groups
  * as_html(): combine equal table cells to shorten output (by 10% or so)
  * as_html(): remap "fill" to "background" for classes (especially "graph")
  * as_html(): caption gets graph's background as background

2005-09-04 v0.27 Tels 1058 tests - Offset, offset, offset, offset the position...
  * remove Graph::Easy::Cluster, and overhaul relative-node position code
    + use "[ B ] { origin: A; offset: 2,0 }" to position A relative to B
      (no cluster needed anymore)
    + can position C relative to B, which is relative to A, and so on
    + works correctly with multi-celled nodes
    + update doc for this feature
  * remove "point-style: none" - "shape: invisible;" already does the same
  * remove "point-style: ring" - is: "point-style: circle; fill: white;"
  * add "point-style: diamond"
  * add attribute arrow-style (open, closed, filled) for edges
  * add attribute "fill" (color inside shape) and change notion of "background"
    to the color outside the shape (important change for nodes)
  * add attribute "label-color" for edges
  * attribute "border-style" was accidentily allowed only as "border-shape"
  * remove node styles: box, rectangle (were aliases for "rect"), plaintext
     (was alias for "none")
  * Save memory: Nodes use 638 (vs 770) bytes, Edges 631 (vs 683) Bytes, this
		 makes a big graph use about 10% less memory (and it is
		 generated in about 6% less time) (measured on 32 bit system)
  * fix small nits in Graph::Easy::Attributes
  * define possible values as lists in Graph::Easy::Attributes, removes double
    definitions in both code and documentation that could get out of sync
  * examples/common.pl was broken - thanx to Vagn Johansen for the report!
  * disallow arguments to new(), leave only in:
    * Node: "label" and "name" 
    * Edge: "label", "name" and "style"
    * Parser: "debug"
    * Node::Cell: "node"
  * remove useless subroutine contains() in Node.pm
  * build/gen_manual: generate doc for group attributes, too
  * build/gen_manual: generate color table from definitions in code
  * build/gen_manual: split attributes into 4 sub pages and add an index
  * build/gen_manual: include sample graphs
  * as_graphviz(): quote reserved words: /(strict|(sub)?graph|node|edge)/i
  * as_graphviz(): quote attribute values with non \w chars
  * as_graphviz(): support for all flow directions (left, right, top, bottom)
  * as_graphviz(): fix colors because dot et. al have a different idea on what
		   color "grey" actually is. This is solved by making checks
		   on attributes on Nodes etc. strict (it converts "red" to
		   "#ff0000" on input) and then outputting the raw RGB colors
  * as_graphviz(): support for bidirectional and arrow-less edges
  * as_graphviz(): add support for different arrow styles (except filled with
		   different fill color)
  * as_graphviz(): support anon nodes properly (rendered invisible)
  * as_graphviz(): correctly handle link, linkbase and autolink attributes
  * as_graphviz(): use graph ID to construct graph name (usefull for imagemaps)
  * as_html(): reimplement output for edges with 4x4 table cells, including
               correct start/end points, label colors. Finally works in all
	       major browsers and looks better than ever :)
  * as_html(): generate graph-table caption from label attribute
  * as_html(): correctly handle multi-celled nodes
  * as_html(): generated links have class 'l'
  * as_ascii(): handle multi-lined labels on edges correctly
  * as_ascii(): invisible nodes are 3x3, not 5x3 in minimum size
  * don't unnec. load "Heap" and "Heap::Fibonacci"
  * Graph: add as_txt_file() as alias for as_txt()
  * add weaken() in Edge::Cell to trigger early DESTROY of graphs
  * move the ASCII code to Graph::Easy::As_ascii and load it on demand
  * Parser: report wrong attribute names/values better
  * Parser: allow '$graph = Graph::Easy::Parser->from_text("...")'
  * Parser: fix parsing of undirected edges with following nodes/attributes
  * Parser: parse "[ A ]\n { ... }" and "[ A ] { ...\n...}" properly
  * Parser/Layout: support undirected (arrowless) edges properly
  * Layout: set proper flags for bidirectional edges (so they are rendered
            correctly (Thanx to Scott Beuker)
  * Layout: stop an endless loop in the chain-backtracking code
  * Layout: set correctly edge label cells on found A* paths
  * setting the attribute 'origin' and 'offset' on a node works now correctly
  * attribute are now strictly checked on Nodes, Edges etc, too
  * fix unitialized warning in Graph::Easy::Layout::Scout
  * fix broken link to EXAMPLES in POD (Thanx Scott Beuker)
  * border_attribute(): return no width if style eq 'double'
  * remap_attributes(): fix handling of 'all' entries for attributes
  * remap_attributes(): add handling of 'undef' to force attributes

2005-08-21 v0.26 Tels 1007 tests - Speed, speed, speed, speed up the code...
Fixed:
  * as_ascii(): render node labels centered, instead on top-left corner
  * as_ascii(): on clustered nodes, collapse borders
  * as_ascii(): output edge labels on VER edge pieces, too
  * as_ascii(): render end/start points on CROSS edge pieces
  * as_ascii(): multi-celled nodes only worked when layout was not completed
  * as_ascii(): crossing between different line styles are rendered better
                than simple '#':

       |       |       |       |       :       H
    ===+=== ###+### ...!... ~~~+~~~ ---+--- ---H---
       |       |       |       |       :       H

  * create shorter self-loops (block only 1 cell/1 port vs. 5 cells/2 ports)
  * add_edge('A','A') works now, and creates only one node object
  * make node attributes "size", "columns" and "rows" really work
  * Node: make edges_to() work correctly with self-loops
  * A*: only cross HOR/VER edges when they have no start/end points nor labels
  * A*: use Heap::Binary (slightly faster) and inline $elem->fields() call
  * Layouter: try to place nodes in chains first near their chain parent
  * Layouter: better fallback strategy upon blocked paths
  * edges with one bend now correctly have their label on HOR piece
  * make attribute checks via Graph and Parser "strict", e.g. it will fail on
    unknown attributes or invalid values
  * fix parsing nodes after attributes like: "graph { color: red; } [ Bonn ]"
  * we do not need to create filler cells unless there are groups, this makes
    generating layouts w/o groups between 10 and 30% faster.
Added:
  * color attributes are now stored as '#ff0000' and output as 'red' or
    '#ff0000', depending on output format.
  * Graph: option "strict", on by default, this makes set_attribute() check
           all attributes and their values strict
  * add option "flow" to graphs and nodes: general flow of edges
  * near_places(): takes list of edge types
  * A*: allow last edge piece to cross a horizontal/vertical edge
  * build/gen-manual: generate manual page with attribute descriptions from
		      table in Graph::Easy::Attributes automatically

2005-08-12 v0.25 Tels 885 tests - Speed, speed, speed, speed up the code...
Added:
  * $graph->add_edge('A','B') works now and is documented
  * $graph->add_edge('A','B') in list context returns nodes and edge
  * $graph->add_cluster('A') works and returns created cluster object
  * Graph::Easy: timeout(): get/set timeout in seconds for layouter
  * Layout: calculate chains-of-nodes, and lay out path along these chains
	    longest one first. This greatly detangles many layouts.
Fixed:
  * as_ascii(): Drawing line crossings now works. Really! Believe me!
  * as_ascii(): labels on horizontal edge pieces are now included
  * rename "todo/" to "todos/" because case-insensitive OS have problems
           with "TODO" and "todo/"...
  * layout: move the alarm(0) to where it belongs and propagate
            fatal errors to the outside
  * Layout: calculating positions needs an int() to have nodes not fall
            between the cell-grid
  * Node: move the assignment to {id} into new(), so that subclasses
          like Graph::Easy::Edge etc get a unique ID, too
  * use Scalar::Util's weaken so that the Node's references back to their graph
    do not prevent the graph from being freed
  * Upon DESTROY, reset the appropriate fields in node/edge objects, so they
    can be reused safely in other graphs
  * A*: fixed an endless-loop in the path-backtracking code
  * adding node clusters as well as managing them is now easier
  * No longer uses Graph. We store nodes/edges in a hash in Graph::Easy object
    as opposed to the Graph object. In addition we store per-node the edges
    this node is involved in. This all results in less code, great speed and
    memory improvements (see bench/no_graph.txt): v0.25 uses only about 50% of
    the memory as 0.24!
    Even the testsuite is much much faster, despite the new tests:
     0.24: Files=23, Tests=820,  5 secs ( 4.37 cusr +  0.50 csys =  4.87 CPU)
     0.25: Files=23, Tests=859,  4 secs ( 2.37 cusr +  0.31 csys =  2.68 CPU)
    Loading Graph::Easy now takes less time & memory, too (output from top):
           VIRT  RES  SHR 
     0.24: 8252 5712 1444 
     0.25: 5840 3376 1432 

2005-08-07 v0.24 Tels 820 tests - Fix, fix, fix, fix the bugs...
Added:
  * node attribute: "point-style" - set style for nodes with "shape: point"
  * remappig of attributes can take code-ref for special handling
  * A*: create crossings, and proper edge end/start pieces, fix bias
Fixed:
  * Graph::Easy POD: add note to add_edge() about multi-edges
  * correct POD in Graph::Easy::Node::Cell
  * Graph::Easy::Edge->new( label => 'foo' ); did not work
  * remap_attributes(): suppress empty attributes (fixes as_graphviz)
  * as_graphviz: suppress "border-style" on edges and nodes
  * as_graphviz: properly remap edge attribute "style"
  * as_graphviz: do not include class as attribute in output
  * as_graphviz: fix broken comment (graphviz uses //, not #)
  * as_graphviz: default node settings are included in class "node"
  * as_graphviz: escape '"' (double quoting char) to avoid issues with node
		 names like '2"'. Also avoid quoting plain node names when
		 possible.
  * as_graphviz: output nodes with their name, not their label
  * as_graphviz: multi-edged graphs work now correctly
  * as_ascii: implement rendering of nodes with "shape: point"
  * as_ascii: render edges with style 'bold'
  * as_ascii: properly render edge pieces without gaps
  * as_ascii: render edges seemless (".-.-.-.-" vs. ".-.--.-.-.-")
  * as_ascii: render all combinations of edge pieces and start/end points
  * as_svg_file: did not pass $self to _as_svg(), inducing a fatal failure
  * Parser: drop support for parsing reversed edges ("<--"), this never
	    worked reliable and made parsing of normal edges with labels
	    much harder and error-prone due to ambigitous cases.
  * Parser: fix parsing of bidirectional edges
  * Parser: fix parsing of edges with labels containing "-", "[" etc
	    (edges labels can now contain any character unescaped except ">",
	    which must be escaped with "\" as "\>")
  * Layouter: weed out positions for a node that are too close to a successor

2005-07-31 v0.23 Tels 765 tests - Fix, fix, fix, fix the bugs...
Fixed:
  * update POD to reflect that the overall placement strategy is now better
  * warn on broken Graph 0.66
  * t/parser.t: sort edges on label to avoid hash key ordering tripping us up
  * sorted_nodes(): use "name" as second field if a non-unique first field
                    sorting was requested (like sorted_nodes("layer"))
  * _near_places() works correctly on multi-cell nodes and add a
    parameter $d to it, so that the distance can be adjusted by the caller.
    It can also return direction of place from/to node via third paremeter.
  * Layout/Scout: removed _find_path_u_shaped() (use A* instead)
  * cleaned up path finding/scoring/handling code
  * EDGE_SHORT_N vs EDGE_SHORT_S to be 0,1,2,3 in order E,S,W,N
  * self-loop paths (from A to A) correctly set EDGE_LABEL_CELL on the HOR
    edge pice
  * finding paths is now slightly faster:
      self-loop : 20,000 tries/s (vs. 15,000 tries/s)
      short edge: 74,000 tries/s (vs. 21,000 tries/s)
  * Paths with one bend now have always the correct edge piece.
  * Placement of node with two predecessors in a straigght line was wrong
    (instead of trying to place the node in the center, it placed it 1/2
     the distance to the right/bottom - Thanx to Scott Beuker for providing
     a testcase!)
  * as_ascii(): align the different edges better
  * as_ascii(): the border is now drawn into a framebuffer, this makes it
                possible for collating borders or to have "border-top: none"
  * Edge are nown drawn seemless, except these pieces:
      CROSS
      S_W
      N_W
    In addition, the seems break sometimes on edge styles "- ", "= ", ".-"
    and "..-" due to non-alignment.
  * move color checking/converting code to Graph::Easy::Attributes
  * check border-styles against list of valid names
  * as_ascii(): added the ability to have different pieces for corners
  * as_ascii(): border styles 'wave' and 'dot-dot-dash' have now two different
                vertical characters, rendering these borders now like:
    *~~~~~~~~* +..-..-..+
    {  Test  { |  Test  |
    }  Node  } :  Node  :
    *~~~~~~~~* +..-..-..+
Added:
  * border-style: double-dash:
    #= = = = #
    "  Test  "
    "  Node  "
    #= = = = #
  * edge style: double-dash: "= = = >"
  * Graph::Easy::Attributes and tests for it
  * Node: is_multicelled()
  * Graph: is_simple_graph(), debug()
  * A* implementation to find arbitrary paths (even with multi-celled nodes)

2005-07-13 v0.22 Tels 686 tests - Fix, fix, fix, fix the bugs...
Fixed:
  * Edge/Parser: edge style '~~' (wave)
  * Layouter: assign layers, process nodes sorted by layers
    (fixes the '"[B] [A]->[B]" being laid out different from "[A]->[B]"' bug)
  * Edge.pm: remove needless new()
  * Makefile.PL check for As_svg was borked
Added:
  * Node.pm: add columns(), rows(), grow(), connections()
  * Layout.pm: add _assign_layers()
  * Easy.pm: sorted_nodes() takes 1 or 2 optional field names to sort on
  * _near_places() moved into Graph::Easy::Node, make it multi-cell aware
  * started laying down the foundation for multi-celled nodes support
    in Path.pm/Scout.pm

2005-07-10 v0.21 Tels 605 tests - Fix, fix, fix, fix the bugs...
  * As_graphviz: default nodes to filled, fontsize 11
  * As_graphviz: quote attribute values if nec.
  * As_graphviz: remap attribute names (background => fillcolor etc)
  * As_graphviz: output edge attributes
  * As_txt: use remap_attribute()
  * Easy: add remap_attributes(), as_svg_file(), as_ascii_file()
  * Easy: fix POD for add_node(), rem doc about add_vertex(), vertices()
  * Easy: add_node() returns newly added node and copes with ("name")

2005-06-25 v0.20 Tels 589 tests - Fix, fix, fix, fix the bugs...
  * put SVG code into a seperate package, see there for CHANGES
  * add some details to POD
  * border-style "dotdashed" renamed to "dot-dash"
  * added border and edge-styles: "dot-dot-dash", "wave"
  * make "border" set the attributes border-width, border-style, border-color
  * as_txt(): output "border" as it used to, even though only
    /border-(style|width|color)/ exist now
  * as_txt(): sort attributes by name on output to make it more predictable
  * as_ascii(): render border styles: double, wave, dot-dash, dot-dot-dash
  * as_ascii(): render edge styles: wave, dot-dash, dot-dot-dash
  * as_html(): fix overly big circles on labels with line breaks
  * as_html(): fix edge style on edges with labels
  * Easy: add_edge() returns the newly added edge
  * Parser: handle edge styles "~~" (wave), ".-" (dot-dash) and "..-" (dot-dot-dash)
  * Parser: recognize all official W3C color names from SVG spec as input
  * Parser: reject invalid colors and node shapes
  * Parser: allow 'Graph::Easy::Parser->from_file(...);'
  * Parser: improve POD
  * Node: streamline attribute() and title()

2005-06-12 v0.19 Tels 573 tests - Shape, shape, shape, shape the nodes...
  * moved manual and Pod2HTML to Graph::Easy::Manual to avoid dependency
    on Pod::Simple
  * Graph/Easy.pm: add seed(), randomize(), as_ascii_html()
  * Graph/Easy.pm: rem stray debug print in add_edge()
  * fix POD about limitations, multi-edges are possible since v0.18
  * Parser: allow GLOB and similiar things as file to from_file()
  * Easy: add/del of clusters/groups invalidates the current layout
  * as_ascii(): fix output of nodes with "border: none;"
  * as_ascii(): implement border "dashed;", "dotdashed" and "bold"
  * Easy: add _framebuffer(): generate empty framebuffer for as_ascii()
  * Easy: make _framebuffer() twice as fast
 
Renamed to Graph::Easy:

2005-06-11 v0.18 Tels 573 tests - Shape, shape, shape, shape the nodes...
  * renamed from Graph::Simple to Graph::Easy
  * small cleanups (bumping $VERSIONS, remove unnec. error() routines etc)
  * fix =begin graph/end graph in doc/manual/*
  * Graph::Easy::Pod2HTML and examples/pod2html support outputformat,
    especially "html" and "src,html"
  * fix Graph::Easy::Pod2HTML to work almost (the graphs still appear
    somewhat out-of-order in the output...)
  * forgot to include doc/manual/index.pod
  * add one more test for ASCII rendering of autosplit nodes (with hole)
  * Parser: do not create empty nodes on autosplit clusters
  * re-factor code to allow multi-edges (more than one edge from A to B)
  * add tests for multiedges
  * call "_correct_size_$format()" if possible
  * As_svg: add _correct_size_svg() for Nodes and Edge/Cells
  * As_svg: correctly center text for node labels
  * As_svg: draw hor/ver lines for edges
  * As_svg: draw arrow heads for edges
  * As_svg: include a comment with edge type and source/target node
  * As_svg: fix position/size for nodes with shape diamond/circle/ellipse
  * _prepare_layout() expands cells sizes to maximum column/row size
  * Node: add shape()

2005-05-29 v0.17 Tels 559 tests - Edge, edge, edge, edge towards the node...
  * rename examples/txt2ascii to examples/as_ascii
  * fix examples/as_ascii to actually work
  * add examples/as_html
  * amend INSTALL, README
  * add complete manual (doc/manual/*) and doc/gen_manual to generate HTML
    version of the manual
  * add Graph::Simple::Pod2HTML
  * include tests for different node shapes
  * suppress attribute "shape" in HTML output
  * as_html: for "shape: invisible", output empty table cell
  * as_html: for shape rounded and circle, use moz-rounded-border
  * as_html: treat "\n" in edge labels properly
  * as_svg: handle shape: invisible
  * as_svg: fix output for "shape: rounded;"
  * as_svg: fix general output to be valid
  * as_txt: output [ name ], not wrongly [ label ]
  * as_ascii: node size depends on label, not name
  * as_ascii: handle multiline labels correctly
  * as_ascii: avoid framebuffer underruns on certain layouts
  * added Graph::Simple::Cluster - list of relatively positioned nodes
  * Node  : added add_to_cluster(), origin(), cluster(), relpos(), place(),
	    dimensions()
  * Node  : allow label => 'label' to be passed to new()
  * Node  : move as_graphviz() to As_graphviz.pm
  * Node  : _correct_w() to _correct_size() and pass it the format name
	    (ascii, svg etc)
  * Simple: amended LIMITATIONS in pod
  * Simple: added output_format(), output(), cluster(), clusters(),
	    add_clusters()
  * Parser: support clusters and autosplit nodes like "[ A |  | B || C ]"
  * Parser: remove multiple spaces in node names to normalize them
  * Parser: fix parse_error() and add tests for that
  * Layout: make layouter more robust (better placement of nodes)
  * Layout: finally find paths with one bend properly
  * Layout: move pathfinding code to Graph::Simple::Layout::Scout
  * Layout: move path management code to Graph::Simple::Layout::Path
  * Layout: find path loops (from one node back to same node again)
  * Layout: find U-shaped paths
  * Edge  : add styles for EDGE_x_y (x = N/S, y = E/W)

2005-05-17 v0.16 Tels 426 tests - Make, make, make, make the invisible nodes...
  * forgot to include As_svg.pm
  * Simple.pm: Note other formats in NAME and SYNOPSIS sections
  * As_svg: small cleanups

2005-05-16 v0.15 Tels 422 tests - Make, make, make, make the invisible nodes...
  * load the As_*() modules on-demand
  * fixed NAME in As_graphviz
  * add basic support for node shapes
  * Node: add del_attribute(), as_svg(), title()
  * Parser: check attributes more closely
  * Parser: support [] for anonymous, invisible nodes
  * added Graph::Simple::Node::Anon
  * Graph: move code to prepare layout from as_ascii() to _prepare_layout()
    since it can be reused by as_svg()
  * as_html: deal better with empty graphs
  * as_graphviz: default node shape is rectangular
  * Node: successor/predecessor did corrupt nodes w/o a graph
  * Node: add _reset_id() for testsuite
  * require Graph 0.65

2005-04-11 v0.14 Tels 354 tests - Lay, lay, lay, lay out the edges...
  * add experimental graphviz output
  * require Graph 0.61

2005-02-12 v0.13 Tels 345 tests - Group, group, group, group the nodes...
  * shorten CSS considerable (especially for graphs with groups)
  * fix CSS for Opera/Firefox for vertical edges
  * fix node-borders for Firefox/Opera by inserting dummy cells at each row

2005-02-07 v0.12 Tels 345 tests - Group, group, group, group the nodes...
  * register groups with the graph when adding them
  * Parser: parse attributes on groups like: "( Group [ Node ] ) { ... }"
  * Parser: parse attributes on edges like: "[ 1 ] -> { ... } [ 2 ]"
  * Group: handle attribute "nodeclass" - put nodes into that class
  * Node: handle attribute "group" - puts node into that group
  * Node: query "node.class" from graph before trying just "node"
  * Node: convert literal "\n" in label/name to "<br>"
  * Layout: padd around all cells with filler cells (to make group backgrounds
    really work)
  * Layout: cleanup on group output
  * as_txt(): output attributes of a group
  * add Graph::Simple::Node::Cell, Graph::Simple::Group::Cell
  * moved Graph::Simple::Path to Graph::Simple::Edge::Cell
  * Graph: shorten HTML output by combining table cells with colspan=X
  * Graph: use CSS child selectors to shorten classnames (and remove
    class='fill' or class='' from output)
  * Graph: as_html(): fix IDs on labels, lines etc
  * Graph: fix layout code for edges with labels: no longer needs position:
    relative, allows better copy&paste and is not garbled on scrolling
  * syntax.pl: support custom template name
  * simplifiy and generalize t/simple.t
  * always run test files under -w
  * don't use warnings (for older perls)
  * remove needless routines in subclasses of "Node"
  * use Test::Differences if t/ascii.t fails

2005-01-31 v0.11 Tels 294 tests - Close, close, close, close the ugly holes...
  * Parser: add parsing of groups like in "( Groupname [ Node ] )"
  * Parser: fix for "[1] -> [2] -> [3] { ... }" to not lose attributes on 3 
  * Parser: can now handle "[1], [2], [3] -> [4]" correctly
  * Parser: cut out rendundant parsing code
  * Graph: add group(), add_group(), del_group(), groups()
  * Graph: fix css(): 'link', 'label' and 'title' do not need to appear in CSS
  * Graph: suppress default attributes from groups, too
  * Graph: close "holes" in "arrows" (edges) with line-height & letter-spacing
  * Graph: inherit background from page, no border as default
  * Graph: as_html() - remove trailing empty tags for shorter output
  * Node: add group(), groups(), add_to_groups()
  * Node: rename as_txt_node() to as_pure_txt(), document it
  * Node: add label() and the handling of the label-attribute
  * Node: support "label" as property in autolink/autotitle
  * Node: as_txt(): no need to quote ":" and " " in attribute values
  * Node: as_html(): quote " " in URLs
  * Move as_txt() to As_txt.pm to reduce code size
  * Group: keep nodes indexed by their name
  * Group: fix as_txt() to quote group name, and include nodes
  * Group: fix: add_nodes() did include the group itself by accident
  * include examples/base.css for output of syntax.pl
  * fix examples/syntax.tpl to have a non-scrolling menu
  * add command-line dirnames to syntax.pl
  * include t/fun/ - fun with graph-examples
  * added Graph::Simple::Path and refactored Edge code - an edge now only
    knows as_txt(); The other two, as_html() and as_ascii() are handled by
    Path.pm (for each element of the edge seperately)
  * more syntax examples

2005-01-24 v0.10 Tels 248 tests - Color, color, color, color the pretty graph...
  * added more stress/syntax tests
  * fix parser to not treat colors in attributes as comments (like in
    "color: #808080")
  * use a pre-compiled regexp to match edges (cut down code-duplication)
  * parser now handles successfully node chains like:
    [ Ulm ] -> [ Lahn ] -> [ Bonn ]
    -> [ Trier ]
    [ Stein ] -> [ Wahns ]
  * Simple.pm: fix edges() in list context to actually work
  * require Graph v0.55 (to be safe)
  * Node: add attributes_as_txt(), as_txt_node() to allow $graph->as_txt() to
    output node attributes only once
  * Graph: as_txt(): output node attributes only once
  * Graph: add set_attribute()
  * examples/syntax.pl: generate headlines from comments in input, add footer
  * Graph: support attributes: linkbase, autolink, autotitle, link, title
  * Graph: as_html(): output title attributes, as well as links

2005-01-12 v0.09 Tels 147 tests - Place, place, place, place the pesky nodes...
  * Layout: try to place node with only one predecessor around the predecessor
  * add a stress test with a star-shaped graph (5 nodes)
  * add a syntax test with newlines and one without any spaces
  * Parser: accumulate left-over fragments to parse examples broken by newlines
  * Parser: use compiled regexps for nodes, attributes etc
  * Parser: finally handle trailing attributes on nodes
  * Node: add set_attributes() for setting multiple ones at once
  * Node: setting attribute "class" will set subclass instead
  * add tests for parsing:
    [ node ] { attribute: value; }
    [ node ] { attribute: value; } -> [ node2] { attribute: value }
  * fix edges going to the left
  * tests for quoting in node names

2005-01-10 v0.08 Tels 133 tests - Fix, fix, fix, fix the stupid bugs...
  * grapher tries to place nodes without any incoming edges into first column
    (this fixes all the examples which have groups of not-connected nodes)
  * in HTML, use monospaced font for edges (prepare for box-art)
  * Layout: set error if layout stage fails
  * Edge: add EDGE_N_E, EDGE_N_W, EDGE_N_E_W etc for corner pieces
  * Edge: add clear_cells()
  * make _trace_path() more general by having _trace_straight_path() creating
    the edge types
  * Node: as_html(): no longer outputs 'style="border: none"' for class="edge"
  * Node: include attributes in as_txt() as well as classes (for subclasses)
  * Node: add class()
  * Graph: always register nodes/edges with the graph
  * Graph: as_txt() includes attributes (unless they are the defaults)
  * Node: postpone calculation of 'w' (called by as_ascii() from Graph)
  * add a stress test with a bend edge

2005-01-09 v0.07 Tels 124 tests
  * Parser: ignore empty lines
  * Parser: unquote all special chars, not only the first 
  * Node: quote node name in as_txt()
  * Parser: _parse_attributes();
  * Graph: added attribute(), set_attributes()
  * Graph: added id() to set/get a unique ID per graph
  * Graph: default ID is '', CSS code contains ID in class names
  * Parser: teach it to parse CSS and call $graph->set_attributes() 
  * Edge: output name in as_txt()
  * Layout: use strict, fix _trace_straight_path()
  * t/layout.t: add tests for _trace_straight_path()
  * Layout: simplify _trace_path() by using _trace_straight_path()
  * Layout: can trace straight edges occupying multiple cells

2005-01-08 v0.06 Tels 94 tests
  * fix version in Layout
  * Edge: add EDGE_START, EDGE_END, EDGE_HOR, EDGE_VER, EDGE_CROSS
  * Edge: add cell_type(), add_cell()
  * fix pod with "=end graph" (vs. "=end") sections
  * fix error message in t/ascii.t when reading file fails
  * fix parser: did not add edge if both nodes already existed
  * Layout: add _trace_straight_path() - trace a path horizontal/vertical
  * Layout: add _remove_path() - remove a traced path
  * tests: add t/layout.t, t/syntax/*
  * add examples/syntax.pl, examples/syntax.tpl to create automatic
    syntax test page for website
  * Parser: add reset() and call it from from_text()
  * Parser: handle quoted characters in node names
  * Parser: handle comments

2005-01-03 v0.05 Tels 87 tests
  * fix special paragraphs in pod to use =begin instead of =for
  * typos in pod
  * some more clarifications for LIMITATIONS
  * move the layout code to Graph::Simple::Layout
  * add a testcase with two not-connected node-pools in one graph
  * amend README, INSTALL

2005-01-03 v0.04 Tels 84 tests
  * change code to work with Graph 0.50
  * require Graph 0.50
  * added: Group.pm -- a group of nodes
  * added: examples/html.pl, examples/common.pl and TODO
  * tests: use strict;, add t/edge.t
  * Parser: document the different edge directions and styles
  * Parser: construct edges with the proper style
  * Parser: allow '..>' style
  * Node: 
    + document successorts()/predecessors(), as_txt(), as_html()
    + implement as_html($tag)
  * Graph:
    + _trace_path() can also trace short, straight paths upwards
    + as_txt() uses $edge->as_txt() to render edge
    + as_ascii() generates proper output for edges with the right style
    + as_ascii() no longer generates trailing whitespace on lines
    + add css(), as_html_page(), html_page_footer(), html_page_header()
    + extend documentation, fix typos, add list of limitations

Renamed to Graph::Simple:

2004-12-29 v0.03 Tels 52 tests
  * is a subclass of Graph::Directed, so add it as prereq again :o)
  * Graph::Layout::Simple::Parser - parse graph from text
  * Graph::Layout::Simple::Edge - an edge between two nodes
  * Graph: added node() -  find node by name
  * Graph: add quite some more documentation
  * Graph, Node: added as_txt()
  * Node: added incoming(), and track incoming edges from other nodes
  * added t/parser.t - test text parser
  * added t/ascii.t - parse various text files to ascii

2004-12-28 v0.02 Tels 20 tests
  * added a stack-based, backtracking layout routine, that stuffs nodes and
    paths between them into cells
  * Simple.pm: as_ascii: deal with cell-layout and convert this to ASCII
  * Simple.pm: add doc stub for METHODS
  * Simple.pm: add score(), as_XXX() do layout if it hasn't done before
  * Node.pm: revised code, and better parameter handling
  * no longer needs Graph::Directed or Graph::Layout::Aesthetic as prereq
  * added examples/ascii.pl
  * forgot to add graph.t to MANIFEST

2004-12-27 v0.01 Tels 18 tests
  * original version; created by h2xs 1.23 with options
    -A -X -n Graph::Layout::Simple -b 5.6.1 --skip-autoloader

