GTC: Scene Graph API

[Sebastien Loisel <Sebastien.Loisel@Eng.Sun.COM>]

I just checked in the code I wrote this weekend. Those of you who 
are eager to see the Scene Graph code, check out gtcmetagfx.h 
(that's the scene graph stuff) and flyingducks.c, which is the first 
demo I've converted to use the scene graph stuff (still not finished 
converting it).

I've also fixed the nasty bug of XAutoRepeatOff/On. Now, whenever 
GTC gets the focus, it sets XAutoRepeatOff. When it loses the focus, 
it sets XAutoRepeatOn. In addition, atexit it sets XAutoRepeatOn and 
empties the event queue (to make sure XAutoRepeatOn took effect). 
This works much better than the previous solution (setting 
XAutoRepeatOff and leaving it thus).

Sebastien Loisel -- McGill University -- Sun Microsystems
http://www.math.mcgill.ca/~loisel/

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