Blender Git Loki

Cycles:
* Fix #29354: crash on branch file. Note that for best compatibility, you need
to save your files with one of the latest branch builds, since not all version
patching code was moved to trunk.
* Rename "Cycles" to "Cycles Render" in info header menu.
* Code tweaks to try to fix #29301. It's not a real solution though, I'm thinking
cause is extended precision for floats on some cpu's, used in one case but not
in the other, leading to bounding box intersection issue...