== malefico request ==

This patch implements some improvements to the drawing of ghosts and bone paths for armatures. I've added a new panel in the armature edit buttons for editing these settings.

[quote]
1- Calculate Paths: option to set start and end frame of calculation. When you're dealing with long animations, it might take some long time to calculate. It would be useful that it optionally displays a frame number on the path with user definable steps.

2- Ghosts drawing: currently it draws some frames ahead and some frames back. It is desireable that you can set ghosts in a region. For instance if you are animating a character walking thru a door in frames 200-250, and you 'd like to see that animation even if you are in frame 1000, let's say because you are editing a jump, or the walk itself, it would be great if you can set ghosts for that interval of frames and see how the poses change in that frame interval while you are editing other parts of the animation.
[/quote]

NOTES:
* The old drawing method for ghosts has been preserved (for now). So you can choose between the two drawing methods.
* Frame numbers are currently always drawn on bone paths. This will be fixed tommorrow (or whenever I have time to work on this more)