Getting my 2.56a rig python scrips to work in 2.57a

I recently had some problems getting my 2.56a python scripts to work in 2.57a (e.g. botty rig, welding robot). Thanks to BlenderCookie's qicktip it's an easy fix: http://www.blendercookie.com/2011/03/03/tip-updating-the-ikfk-script-for-api-changes/