This version has been work through for the tutorial: Modelling a Simple Short Hairstyle for Our 3D Animated Character
http://www.youtube.com/watch?v=_-db4Ck8zt4&list=PL-Jnd67hUQS8WaOCWJ7JrmjTN9dvMMe5u&index=9
A lot of work has gone into making this version much more reliable for polygons to be deleted cleanly along the borders when deleting the polygons for a patch.
As a result of this work, polygons are no longer regenerated for patches that have not changed their u or v control point dimension. This means you no longer loose the paint work on your face for example if you insert a control line into the body that does not run into the face.
Bezier control lines now will now mirror drag for a twin.