OO-291: update the bulk changes / user import ... to use the new methods of the business group service

OO-291: fix load for update for PostgreSQL, fix unit test for course group management (always consume entity before queriying the database!), fix the statistics rights in the course view

OO-291: remove doInSync in BusinessGroupService and use pessimistic locking directly on the BusinessGroup

OO-291: optimize synching with instant messaging in the case of batch update, fix rights for the lin links statistics and course db in course...

OO-360, removing warning ifan IM listener is not found (it can happen), remove support for SSL connection to openfire to save memory

OO-356: make the import of groups more robust (in case of very large number of groups), make the import of repository entry more robust (in case of large resource file)

OO-350: make the archiving of dialog course building block robust against special characters in short title

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