Major:
 - add OpenGL 2.0 support
 - add support for initialization on first use
 - add text file for selecting a subset of the extensions

Minor:
 - add support for all SUN, MTX, and OML extensions
 - fix SGI hyperpipe stuff
 - make auto/Makefile more robust against auto/core/*~ mistakes
 - separate build of static and shared object files
 - web page and documentation update
 - web poll on separating glew, glxew and wglew