Strokes the current active path with the currently selected brush.
How to test:
* Create a new image.
* Draw with the path tool
* Go to Filters -> Vanca -> ActivePathStrokeDelete
It is recommended that you set a shortcut to this script.
-- NOTES and Limitations --
* The script can not scale the brush
(actually, a problem with Gimp, since it does not - for the moment -
allow scripts to access the brush scaling)
* The path is deleted afterwards
(the purpose of the script is to provide a quick stroke)