Issue 211: Xlib atoms should always be created if not existing.
Issue 211: Xlib atoms should always be created if not existing.

adamlwgriffiths/Pyglet,seeminglee/pyglet64,adamlwgriffiths/Pyglet,adamlwgriffiths/Pyglet,niklaskorz/pyglet,niklaskorz/pyglet,seeminglee/pyglet64,niklaskorz/pyglet,adamlwgriffiths/Pyglet,seeminglee/pyglet64,niklaskorz/pyglet