Blender Git Loki

Dissolve faces now uses a different method of finding the boundary,
that handles some non-manifold situations better without failing.
Also made edge subdivide use a more specializzed internal version
of BM_Connect_Verts, that should hopefully always split the correct face.

Dissolve verts also now has checks to not accidentally dissolve
unselected vertices. It's not kindof a hybrid tool, using dissolve
faces where it can to dissolve verts for robustness, and using
BM_Dissolve_Verts where it cannot.

And removed some cruft from a few API functions.