functions that create special X-Objects. e.g. special-window:none,
special-pixmap:copy-from-parent.
- added a discloser for windows (makes debugging easier).
- fixed bugs in gcontext-font, get-window-attributes and text-width
- added enumerated types for colormap-alloc in create-colormap and grab-mode
- replaced most of symbol or symbol list arguments by enumerated types,
enum-sets and alists of enumerated types.
- reformed event representation. Every event has it's own record-type now.
frese