Better error reporting using the OpenGL debug extension

You'll want an up to date version of GLEW and drivers for this (nvidia 305.53 and up).

Conflicts:
	win32/vc2010/graphics/graphics.vcxproj
	win32/vc2010/graphics/graphics.vcxproj.filters
add GLDebug.h to src/graphics/Makefile.am
allow GLDebug to be enabled/disabled via a config.ini option
disable GLDebug if GLEW doesn't support KHR_debug
Merge remote-tracking branch 'johnbartholomew/opengl-debug' into opengl-debug
newlines
Merge branch 'opengl-debug'
move fixes to fixes