Blender Git Loki

- removed 'gldrawbuffer()' and 'glflush()' calls from main buttons loop.
these calls were done without anything actually happening, for each
mouse move, and caused quite some slowdown at OSX.
Might help the other platforms as well. Check it by just moving your mouse
around, over window edges, buttons, etc. Especially Radiosity buttons
were horrible slow in a large window

Please be aware that the above calls cause a swapbuffer at OSX!