Blender Git Loki

Fixed updating displacements for meshes with more than one polygon

Fixed updating of normals during sculpting for non-smooth multires meshes.

Enabled updates of normals when sculpting on a multires mesh (only works for smooth meshes now)

Big commit with initial support for sculpting of meshes with the multires modifier.

With this commit, the displacement custom data is being applied to a subdivided version of the base mesh using a modification of CCGSubsurf.

Sculpting on the highest level of the multires mesh now works, with (at least) these caveats:
* Only the plain 'Draw' brush works for now
* Normals aren't being updated during sculpting, so it doesn't actually look right yet
* When displacements are applied or calculated, only interior face points are handled, so original vertices and edge vertices will look wrong after switching levels.

Merged with trunk (15144)

== Multires ==

* Added an MDisps customdata layer to store multires displacements in

== Multires ==

Hid the old Multires panel.

== Multires ==

Added a Multires modifier, including a simple interface. (The modifier and interface are entirely nonfunctioning.)

creating gsoc branch for Nicholas Bishop