Disconnected bones can be translated in pose mode but this translation
cannot be applied to the iTaSC representation of the armature because
there is no joint associated with it. As a result, moving disconnected
bones had no effect. The bug fix is in two parts:
1) manual or rna change in the armature pose will cause automatic
rebuilding of the iTaSC scene
2) the iTaSC scene is now built from the current pose instead of
armature rest pose
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