OO-76: fix activation of the Notifications Panel in Home, fix missing resume controller for OpenOLAT

OO-1, OO-2 : fix some hardlinked references to the default theme, add sound-files, fix modal-dialog-height

OO-65 : 1. replace default plaintextArea with tinyMCE        2. remove "preview" button  (ALSO for Cluster mode)

OO-59: make cache of assessment lazy loading (the cache stay for ever in memory, and the indexer open all courses, create all assessment caches), use the SingletonEhCacheProvider to have a better picture of the cache usage

OO-37 : fix activate() in EPMapRunController / EPMultipleMapController to support GMCTree activation

OO-31 : new method in TextElement interface:  preventValueTrim(boolean preventTrim) , use in wiki: prevent textarea from trimming the wiki-input

OO-55: fix more issues with concurrent edit/view/delete of business group, fix broken equals method of BusinessGroup which generate a lot of invisible exceptions (which consume CPU)