OO-3297, OO-3301: refactor security group management operations in its own DAO, implement isInOrganisation mfunction for course expert rules

OO-2998 make attribute translator configurable, fix problem with course condition editor and session inspector view

OO-2421: enhance the cycle detector to only check expert rules method which have a risk to create a cycle

OO-1593,OO-2057: sync task status with its assessment entry, implement reopen too, selenium test to pick a media in a forum

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

OO-1881: the isAssessmentMode expert rule is now dependent of the user which open the course and not only from the state of the course

OO-1616: fix the certificate unit test in the REST API suite, don't doInSync during import of the course, remove get resource method (duplicate), remove unused constructor and method