* With "AfterTrans Delete Duplicates" and NLA-scaling on, IPO-curve handles were not updated after the operation.
* Sliders drew in the wrong places. Now they are drawn using the Action-Editor api stuff, so they should appear in the right places. I've also tweaked this so that sliders are now shown for ANY selected action channel's ipo-channels and constraint-channels, provided that the channel is in view.