Blender Git Loki

Fix: Collada Exporter/Import break Object hierarchy

Exporter:
Children of Armatures where not exported as children but as sibblings.

Importer:
When an object is linked to an armature then the Importer
unconditionally makes the child a direct child of Armature.
Actually, if the child is already a child of the armature, then
there is no need to reparent it.