Develop jquery tree

I am not sure if other changes will come through but maybe you can just integrate the tree ones
https://github.com/Cipa/ClipperCMS/commit/da252630415a2601c92cb1e7a601c05535ce127c

I also noticed a lot of references too mootools in setup and theme files.
Ajax Search is using moo as well. Not sure what the plan is with this one but we should remove all the mootools references. 

MM - is next for me. I will start with a fresh setup after you integrate the tree.

Thx