Things that should be done someday:

+ Selections should be supported.

+ The mouse drag code should be changed to support a single sweep area
for all screens, and tied in to selections.

+ Colors should be done as X-color resources.

+ Attributes should be a data type, and screens should support an
"attribute table" in the manner of keymap tables and mouse tables.
Stippling should be added, and the ability to make X-pixmap resources.

+ epoch::screen-properties should be set to the supplied
X-defaults on start up.

+ Write a GWM major mode.
