Blender Git Loki

=== Transform ===

[ #5833 ] 2.43 RC2: Incorrect Bone rotation when 3D cursor set as Pivot

There's really ugly stuff going on with pose mode rotation in transform which I'll have to fix later, in the mean time, this commit fixes the problem (which happens when you rotate bones in post mode around an arbitrary point) and includes some juicy comments to further document the actual architectural problem.