[Gzz] 21nd-27th (jvk)

[Janne Kujala]

20th-27th: irregular shape work

Dependent texture accesses seem to not get mipmapped with
NV2x_EMULATE. Going to test with a real GeForce4 today.

Some other things:

- According to OpenGL 1.2 spec, the first parameter of 
  glMultiTexcoord should be a symbolic TEXTUREx constant, not the 
  number x (works that way, too, at least with the nvidia driver). 
  
- For some reason, "from gzz.client import *" no longer works
  in gldemo.py, so I changed it to a list of classes.


        jvk