OO-1557: fix rs if option all users is chosen with groups, fix xss issue with course title, fetch load the group of invitation and add unit test

OO-1548: set configuration for the local query cache and timestamps based on the default configuration of the hibernate-infinispan library

OO-1546: hardened the remove method against unexpected case, identity not participant, don't remove the last user without check it...

OO-1544: better check of the validity of the last history point used in the "close" method of the course tab

OO-1542: copy the list of listeners and loop on the copy to prevent concurrent modification exception

OO-1537: authors can see and edit the business groups in their groups from the user management tool of the course

OO-1511: remove relation to assessment mode if a business group is removed from a course, add unit tests