[Bf-committers] Track weight animation

[Ichthyostega]

Update for sake of completeness:

- YES, you can currently *not* edit automation related to the MovieClipEditor
  in the usual action editors. But you can add and delete keyframes in the
  usual way in the GUI input fields.

- NO, 2d-stabilisation related automation is indeed *properly played back* in
  VideoSequenceEditor and Compositor. Other issues had led me to wrong
  conclusions here.

	--Ichthyo