OO-1929: added new functions to be able to access the userproperty in expert-mode conditions, added corresponding test and error warning

OO-1946: fire event per type, use the official method to check if we are on the "cluster" node which send the event

OO-1945: better naming of user course environment, use the course environment of the assessed identities to update the score...

OO-1942: update the database first and reload the calendar after to prevent recursive reloading the same calendar or calendar with an error

OO-1939: catch rs closing the course, streamlined the initialize of the course editor to prevent to reload and reload the course and the repository entry