Blender Git Loki

Dyntopo branch

* Sculpt expand now works with dyntopo in more cases
* Fixed various dyntopo face set bugs

Stuff from several commits ago:

* There is now an API to get face sets using SculptFaceRef's.
+ SCULPT_face_set_get
+ SCULPT_face_set_set

* Prototyped a faster geodesic propagation function, but it currently
doesn't work.

* Dyntopo triangulation now preserves face flags (took some work as BM_triangulate_face explicitly prevents selection flags from being preserved).
* Also face smooth flags are no longer being overriden.
* Most of the faceset create operators work (I'm not sure I've tested
all of them though).
* SCULPT_face_set.c now has helper functions that checks if a pbvh
is *not* PBVH_BMESH, in which case it builds a temporary bmesh,
otherwise ss->bm is used (sculpt_faceset_bm_begin and sculpt_faceset_bm_end).
+ Note that some functions were able to use SCULPT_face_set_XXX
instead and avoid bmesh entirely.