Blender Git Loki

Graph Editor: "Add at Cursor" options for Insert Key operator in Graph Editor

* Added the ability to add a keyframe at the current cursor location in the
Graph Editor. This is useful for precisely defining the shape of driver F-Curves.

* Fixed a bug where the wrong cursor-x time was being used in Drivers mode
(i.e. it was still using time, and not just any time-value, but the NLA-mapped time!)