OO-2636: implement adaptation of absence if the number of lectures changed, make dedicated close / cancel method in service, implement disable state for auto completer, replace the last step of the wizard, check effective number of lectures agains cancelled status...

OO-2636: add hints, add search of lecture blocks titles, add dates to attendance list, check if the the lecture module is enable in background jobs...

OO-2858: unescape solution of gap text from the tinymce mce plugin because they are send to it escaped

OO-2846: don't persist in memory marks, correctly set the anonym flag, don't toggle back the first mark

OO-2836: add selenium to test hiden section in QTI 2.1 (see OO-2820), hardened open modal dialog and wizard, upgrade drone, remove a lot of @Drone...