This makes a number of operators no longer ask for confirmation, rather it will
show an info message after performing the operation. Ref T37422 for decision. In
particular, these were changed:
* Delete objects, bones, keyframes, masks, mask curves, motion tracks, markers.
* Clear and delete keyframes in the 3D view.
* Align bone to parents.
* Separate bones from armature.
* Group/ungroup metastrips in sequencer.
* Copy/paste objects to/from buffer.
Reviewed By: brecht, dingto
Differential Revision: http://developer.blender.org/D35
Snapping operator in action editor for grease pencil and mask wasn't implemented. We could probably re-enabled/fix/cleanup more things in this area (e.g. use a custom poll func for operators not supporting gp/mask, instead of silently doing nothing), but this is for after 2.65 imho).
