OO-2515: save the master file untouched, deliver  more pixels for the print view of the members course element, add REST api methods to check if a particular size of portrait is available

OO-1770, OO-1769: allow pseudonym and guest posts, refactor the message model to hold only threads or messages of a unique thread in memory, minimize the number of joins on query, minimize the number of queries on peekview, remove buggy docking feature...

OO-1616: reduce the number of double call to the repository entry with the manager and after with the course

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

OO-990: mostly fix of the authoring GUI, and unit tests, integrate the demo course to the test resource

no-jira: fix the error in perf500 test in PropertyTest, remove reference to log4j logger in tests, remove duplicate closeSession in @after

OO-623: add fields for managed groups and repository entries, add a lifecycle DB object, enhance the REST API to search with externalId/externalRef...

OO-538: unify our implementation to retrieve entity managers with spring, remove wrapper classes to acesss directly transaction and entity manager, don't cache them anymore in our code, @Transactional fully functional, add some sleep in unit tests to wait from the new asynchronous multi user events

OO-291: first step: move business gourp manager to a business group service, remove dependency to the context...

OO-204: refactor the DisplayPortraitManager to allow portrait saved in PNG and using the new ImageHelper implementation