Blender Git Loki

- rna attribute setting problem, class instances could not set their own attributes because they are blocked by our own internal setattr.
this could be supported again easily however it leads typo's & api changes not showing any errors.

This broke povray export.
Solution for now is to allow setting private properties starting with '_'

eg,
ob = bpy.context.object

ob._foo = [1,2,3] # this is a python list, it will stay only as long as this PyObject is active
ob.foo = 1 # raises an error!, only for rna properties
ob["foo"] = 1 # converts to an ID property and is saved

using the underscore like this should really be used for classes internally.

- povray failed on armatures

- menu key wasn't using WM_keymap_add_menu