Blender Git Loki

Cycles / CUDA: Increase sm_2x registers to 40.

This fixes the ptaxs "ACCESS_VIOLATION" error and should allow our Linux and Windows build bots to compile again.
Unfortunately this comes with a performance penalty on sm_2x cards, so this is only a workaround for now. Branched Path is still globally disabled on GPU.

GHash/Edgehash: make simple iterator checking functions inline.

also remove NULL check, only a few areas made use of this.

Dyntopo: replace GHash with GSet, saves some memory

DerivedMesh: replace edgehash with edgeset

Mempool: simplify memory chunk list building

BMesh: bmesh_sfme now initializes the copy

BMesh: minor speedup, avoid calloc+assign, assign all members instead

Mempool: delay allocating an initial chunk, its not always used

Matcaps.

Instead of setting color every time, just set it on material enable.
Handles all cases of surfaces. Thanks to Campbell for pointing out!

Code cleanup: remove paranoid NULL check

Fix T39635: Crash convening curve to mesh

Fix T39626 Matcaps not working in edit mode.

Set a while color before the draw call. This will be ineffective in GLSL
but will affect matcaps.

Weekly UI messages fixes...

Fix own rB8714ae09f894: Forgot to handle bone constraints in versionning code!

Color pickers:

* Code Cleanup
* Fix some more color correction cases that were left unattended. (NDOF,
resetting the operation in circle pickers)

Enable openmp in MinGW-w64

Fix own broken rB95b25e7333c4 (crash on any undo op :/).

Issue here was that buttons_texture_context_compute() was getting scene from (button-customized) context,
before the button paths (and hence, context) had been updated. So after an undo, it was getting an invalid
(freed by undo) scene pointer.

Now update BCONTEXT_SCENE path before calling buttons_texture_context_compute().

OpenCL Change opencl_assert to be more like cuda assert where possible.
added some extra warnings and feedback if things go wrong

OpenCL + AMD adapt kernel to newer driver

Code cleanup: make the source G rated again.