Lightweight Java Game Library Code

Added java debug output to linux display.c

Linux: Fixed problem with updating screen dimension globals

Linux: reset/restore gamma settings on activate/deactivate

Linux: improve cursor position handling (warp behaviour)

Linux: Implemented support for Extended Window Manager Hints. LWJGL now cooperates
much better with the window manager, if the X randr and EWMH extensions are supported.
Especially fullscreen handling has improved, by avoiding the use of the override_redirect
flag.

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Linux part:

Merged Window and Display into org.lwjgl.Display
Added support for persistent context. This will enable LWJGL games
to avoid recreating the context resources like textures and display
lists when switching between windowed and fullscreen and/or context
dimensions.

Added PixelFormat class instead of individual parameters to Display.create
and Pbuffer constructor.