now, instead of making hidden copies of faces, the faces are copied into a temp bmesh.
also remove a hash that was being created and not used (old code).
Thanks for Sergey for finding the bug & patching, This fix works a bit differently.
Theres no need to allocate the customdata in the first place - since its written into. So add a flag for vert/edge/face/loop creation functions so they can skip customdata creation.
Added function: BM_face_create_ngon_vcloud
creating quads and tris use this too since it finds the best face winding direction based on surrounding face (if any)
* double default edge allocation size (double the number of verts/faces).
* CustomData_bmesh_init_pool was using allocsize & chunksize as the same variable. Now use type specific chunk size.
* bmesh copy and editmode conversion now allocate the BMesh mempool size needed for the entire vert/edge/loop/face arrays since its known already.
