OO-1873: replace the listing of booking by a native query optimized for our standard setup, replace the .hbm.xml with annotations, add more fetching overall

OO-1443: upgrade JUnit ( long overdue ), remove deprecated junit.* packages, fix some issues with order dependent tests, fix an issue with empty ClusterDoInSync

OO-386: remove the async executor of the repository manager and replace it with a evict from cache, select for update, merge process

OO-291: implements access control in group (with waiting list, special case for paypal...) ad write some unit tests to control the different behaviors