Blender Git Loki

Dupli Bugfixes!

It seems everytime I try to fix something here I break something
else, but anyway, another try at getting this to work properly.

Fixes for:
- Getting dupliverts/faces derivedmesh with orco caused wrong results
on meshes in linked dupligroups with proxy, because modifier stack
was revaluated with wrong object matrix, now gets orco another way.
- Fix render instances being hidden when original object was not added
to the object render list.
- Changed the way object instances find their original objects, now
works the other way around, original objects look for their instances
instead.

There's probably issues still with recursive dupligroups..