Blender Git Loki

Sculpt: various bugfixes

* BMLog now saves face material indices
* Fixed id corruption in join mesh edge case.
* The mesh->bmesh conversion function now checks
if IDs are corrupted in a bit smarter way:
+ Any id that's greater then 5 times the sum of
total elements with ids is assumed to be corrupt.
Avoids very large allocations for the fast element->id
map, which is a simple lookup table.
+ Alternative is to automatically switch to the slower
GHash id->element map.
+ Sculpt code would have to detect this case and regenerate
IDs?
* The slide relax brush is now internally split into two
seperate commands.
* Basic smoothing now uses fewer iterations, velocity smooth
is used to speed up convergence.