Fixed some regressions for working with ctypes 0.9.9.3 (I mistakenly changed code so that it would work with CVS head without providing a backward compatibility layer). Added some code to OpenGLContext to deal with slight API differences between PyOpenGL and OpenGL-ctypes (mostly different data-types). Tested a few GLE functions on Linux, seem to work fine.

Win32 GL is working, but can't get the GLU callbacks to work. I'm guessing it's a problem with the calling convention? Something low level and grotty like that anyway. Didn't start into the WGL wrapper yet.