This commit some of the many bugs here (it's still not perfect now, but much better than it was):
* Moving in/out of Object, Edit, and Pose Modes for Armatures should now work smoothly. Operators should work nicely in the appropriate modes now (select linked might be a bit tempermental still, since it uses mouse-position).
* Fixed the 'mysterious' memory leaks when changing modes. These were only caused when using the mode switching menu in the 3D-View.
* Went through bullet-proofing some of the operator calling functions against NULL operator id-name strings.
6808e15c8d