Blender Git Loki

Cleanup of pose insert methods for Armature objects, as planned in the post to bf-python.
Two sensible methods left in: armatureobject.insertPoseKey and .insertCurrentPoseKey,
but still left unofficial i.e. not published in the api doc yet, because of additional
error checking is still needed and more testing too. But at least is now in better shape to
work on to be published in a later release.