Blender Git Loki

Depsgraph: Traversal for layer flush should be aware of cyclic dependencies

Quite straoghtforward, should have think of it earlier.

Also made transitive relations disabled by default now. They're killing some
relations which keeps thread safety.

So now koro is kinda finally working. There still some issues caused by
dependency cycles which are solved differently from master. Plus threaded
nature of armatures updates also affects in this case..