Blender Git Loki

Correction to previous commit

pBVH nodes buffers could share some pointers from pBVH itself,
and after updating pointers in pBVH we need to recreate this buffers.

This starts looking a bit awkward and seems it's mainly because of
assumptions made when was working on sculpting on deformed mesh.
Would revision such a sculpting and would try to make it more clear
later.