* Coding style clean up.
* SQL indentation
* Removal of non-matching capabilities when searching.
* Fixed notices/warnings when hitting enter on search.
* Can now compare multiple capabilities at the same time.
* Capability search now persists between requests.
* Upgraded to use renderers.
* Upgraded module.js to YUI shifted module.
* Converted deprecated calls.
* Converted forms to Moodleforms.
* Implemented backend functionality to overview at
different context levels. Not possible presently as
there are no front end hooks.
