fix sphere bug reported by Ken Russell
Mac OS X: Handle frame == null case
Mac OS X: Don't dispose frame if already disposed
Fix a memory leak in extal.c
Mac OS X: Set fullscreen window to null before disposing
Move getPbufferCaps to DisplayImplementation. Mac OS X pbuffer support
Mac OS X: Try harder to reset mouse deltas
Mac OS X: Add error handling to gamma functions
Mac OS X: Implemented gamma
Mac OS X: Work around AWT shifting the fullscreen window off the screen
