Mostly a bugfix update.  This also adds "#version 3.1;" to allow you to use
3.1 style layered textures (with rgbf).

 * Use "#version 3.1;" to use old-style layered textures
   (where filter acts like transmit)
   * Use "#version 3.14159;" (yes, PI) to use filters in textures
     again in the same scene. 
 * Fixed problem with automatic range_divider calculation 
 * Added a better error message for zero vertices in mesh2 
 * fixed bug with spotlight

http://nathan.kopp.com/patched.htm

-Nathan

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