Changed lineeditor to make it work. Fixes #562.Also fixes a problem in command.py get method in handling session handler objects

Changed lineeditor from contrib:
 - fixed parameters on functions
 - added a savedcaller attribute to be able to store the caller attribute for later retrieval. 


Dunno if I made the correct pull/merge/push sequence. Anyway, my last commit fixes the @about command so that does not report south version.