Added some features to the NLA Editor that had previously only been added for the Action Editor.
* It is now possible to choose whether timing is displayed in Frames or Seconds like in many of the other Animation Editors. Use Ctrl-T or the View menu to change this.
* Autosnap behaviour from Action Editor is now also available for the NLA Editor. It was partially done in the previous commit (for transform). Use the new combo-box on the NLA Editor header (like the one on the Action Editor header) to set this.
* editaction.c: silenced a compiler warning from the previous commit related to a function which is no longer needed.
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