added proper docblock to action saveGroupModelTree(). updated user input pre-processing to better handle JSON decoding issues. removed obsolete code docs.
added proper docblock to action saveGroupModelTree(). updated user input pre-processing to better handle JSON decoding issues. removed obsolete code docs.

stopfstedt/ilios,dartajax/ilios,thecoolestguy/ilios,thecoolestguy/ilios,justinchu17/ilios,ilios/ilios,Trott/ilios,justinchu17/ilios,justinchu17/ilios,stopfstedt/ilios,justinchu17/ilios,ilios/ilios,dartajax/ilios,Trott/ilios