It compiles and links, but is *completely* untested. Feel free to
pound on it.
The idea is to do all color management (allocation, etc.) via a
GdkColorContext so that apps will be friendly to 8-bit displays.
GdkColorContext is supposed to work on all visual/depth combinations.
This support, however, is lacking from the rest of Gdk/Gtk. I will
try to work on that.
- Federico
