* OpenGL contexts are allocated by display instead of by widget.

	* Colormaps are not allocated for each widget window but are cached
	  by display (should be perhaps by screen)
	* Freed the visual info returned by each call to glXChooseVisual.
	  This used to generate a memory leak for each widget instance.
	* Adapted for perl/Tk 804.
	* Some better init code to prevent valgrind from reporting use of
	  unitialized memory (can be useful anyway).
	* Commented an OpenGL bug workaround dealing with bad partial
	  redraw after moving the window. It seems to have disappeared
	  (tested with NVIDIA 53.3).
	* Free the drawing GC as part of destroy cleanup.

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