[Bf-python] Patch - Adding foobar.users class ver to most datatypes.

[Campbell J Barton]

Hi, this patch adds a class variable to most blender data types so you 
can see how many users they have.
These are

   1. Metaball
   2. Image
   3. Material
   4. Camera
   5. Lamp
   6. Lettice
   7. Texture
   8. World

Omitting world
- Cam
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