Blender Git Loki

Fix possible concurency issue in mesh normals computation.

Failure in own code from last December, thanks @sergey for finding it.

To be backported to 2.79a.

Fix T52634: EditMesh Remove doubles could hang

A single diagonal axis was used for sorting coordinates,
the algorithm relied on users not having vertices axis aligned.

Use BLI_kdtree to remove doubles instead.

Overall speed varies, it's more predictable than the previous method.
Some typical tests gave speedup of ~1.4x - 1.7x.

BLI_kdtree: utility function to remove doubles

animation bind rotation fix, some dynamic mode fixes

Related to T53003: tweak scene fps range.

Move restricted 'reasonable' range to ui_range, and allow wider values
for manual settings.

Fix T53003: IMB: Invalid framerate handling due to short integer overflow.

FFMPEG uses int for the numerator, while Blender uses a short. So in
cases people gave weird exotic framerate values and we cannot reduce
enough the numerator, we'd get totally weird values (even negative frame
rates sometimes!)

Now we add checks for short overflow and approximate as best as possible
in that case (error should not matter unless you have shots of at least
several hundreds of hours ;) ).

IMB: Add asserts that returned fps and fps base are strictly positives.

Forgot to add that in previous commit, also related to T53003.

Fix part of T53080: all material previews re-rendering after undo.

This reverts commit dc2617130b2e1d7d2b9892fbd7c6e7b60caafb66, which disabled
writing of previews for undo. While this uses some memory, re-rendering all
previews is very expensive, especially if for example you have lots of materials
using high-res image textures.

improved rotation calculation in bind animated mesh

fix for loading crash with dynamic fracture

forgot to copy the fracmesh, but this now might increase mem usage

Fix T53593: sculpt brush rake spacing bug after recent bugfix.

fix attempt for split shard to island crashes

customdata was incorrectly freed and corrupted the memory

added a limit / searchradius for animated mesh binding

bind operator now clears the simulation cache too

Cycles: Fix bug in user preferences with factory startup

Namely, the issue would happen when CPU device was never used before.
Issue with wrong merge conflict resolution.

forgot to include workaround for changing vertex counts

fix attempt for bind animated mesh

Blender 2.79a: Use latest dev-tools

This way release checker used by Linux release environment is corrected.

Blender 2.79a: Show both version char and rc text on splash

Blender 2.79a: Use proper version char

Blender 2.79a: Point submodules to updated hash