GTK + OpenGL

Got gtkglextmm up and running. Bit of a pain since I couldn't find a rpm for it, so I had to build it from source (and pass some options to ./configure).

Anyways, now that I have OpenGL working with GTK+, i'm going to take out the heightmap generation code from my engine and put it in a GTK app that creates them. Ahh the joy of tools programming...