There's an utility in the contrib directory called mapmapper which
converts old style maps (1.x) to new style maps (2.x).

The new map format is as follows:

	SYMBOL			MEANING

	x			Completely filled block
	s			Upper left half filled
	w			Lower left half filled
	q			Lower right half filled
	a			Upper right half filled

	#			Fuel block

	r			Upwards cannon
	d			Leftwards cannon
	f			Rightwards cannon
	c			Downwards cannon

	_			Neutral base
	0..9			Base belonging to team n
	*			Treasure (belongs to team with closest base)
	!			Target (belongs to team with closest base)

	+, -			Positive/repelling and negative/attracting grav
	>, <			Clockwise and anti-clockwise grav

	@, (, )			In/out, in and out wormholes respectively

	A..Z			Checks, 'A' = start

	$			Force the direction of homebases.
				Players starting on homebases that are
				adjacent to this symbol will start with the
				front of their ship pointing to this dollar
				sign.  Clients don't draw this symbol.

	%			Item concentrator.  Putting it in a map will
				determine where items appear.  When one or
				more item concentrators are in a map then
				all items appear only in an area around the
				item concentrators.  The area is a circle with
				a radius determined by the server option
				-itemConcentratorRadius.  If no item
				concentrators are defined in a map then items
				can popup anywhere.  An item concentrator is
				drawn on screen as three rotating triangles.

	any other char		Empty block

In case you are wondering if all the characters for map symbols have any
special meaning, they are not abbreviations, but if you take a look at
where they are placed on the keyboard, you might grasp the logic behind
selecting them.  Try imagining the block center between the keys qwas
(for the logica behind qwas) and between dfrc (for the logic behind dfrc).
'x' was just chosen since it makes a nice 'fill it all' character.

