enchance the backend module with a foldable category tree

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/slub_events/trunk@79909 735d13b6-9817-0410-8766-e36946ffe9aa
backend module: add search in event titles

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/slub_events/trunk@79912 735d13b6-9817-0410-8766-e36946ffe9aa
added css class no_subscription into fullcalendar export if no subscription is possible anymore

git-svn-id: https://svn.typo3.org/TYPO3v4/Extensions/slub_events/trunk@79914 735d13b6-9817-0410-8766-e36946ffe9aa