patch #2869 MTex module additions

contributed by Yehoshua Sapir (sapir)

adds attributes to MTex module.  adds module constants.
Uses new style tp_getset.

source/blender/python/api2_2x/doc/API_intro.py

@@ -41,7 +41,7 @@ The Blender Python API Reference
   - L{Text}
   - L{Text3d}
      - L{Font}
-  - L{Texture}
+  - L{Texture} (*)
   - L{TimeLine}
   - L{Types}
   - L{Window}