Blender Git Loki

Just code cleanup here. I tried to check if a replacement of malloc() and
friends with a group-malloc system would speedup. That wasn't...
While doing this I noticed such mess... so spent a while cleaning things
a bit:

- all malloc() replaced with MEM_mallocN()
(this except for vertices/edges/faces, for speed)
- unified free_xx names, this was too confusing! so now we have:

free_editvert()
free_editedge()
free_editvlak()

free_vertlist()
free_edgelist()
free_vlaklist()

and only very few calls to free() and alloc() themselves.