OO-1436: fix an issue with a method's signature, log audit creation of identity and authentication, show errors after import of users...

OO-1435 allow fullscreen mode in iframes (IE11+, FF, Safari, Chrome), set max size of video player to 100% (a little bit responsive)

OO-1424: remove subscriptions if a member is removed from a group or a course, or a group is removed from the relations to a course

OO-1349: filter the tree to select the start course element, use the runstructure instead of the editortreemodel, remove the lockMode ( as security ), ips and keys mandatory if options checked

OO-1408: add last modified date in efficiency statements list, add link to courses in user management, add coaching button in user management