added the flag group_exclusive to material

added restrictDraw/Select/Render to objects in python
updated group and scene docs for last commit
made 3ds import use new scn.objects rather then Object.New() - (removed import as instance for now)
fixes off import error from this report http://blenderartists.org/forum/showthread.php?t=84182

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

@@ -66,6 +66,7 @@ Example::
     - FULLOSA      - Force rendering of all OSA samples.
     - TANGENT_V    - Use the tangent vector in V direction for shading
     - NMAP_TS      - Tangent space normal mapping.
+    - GROUP_EXCLUSIVE	- Light from this group even if the lights are on a hidden Layer.
 
 @type Shaders: readonly dictionary
 @var Shaders: The available Material Shaders.