OO-502: move the groups / roles cache from the RunMainController to the UserCourseEnvironment to speed-up the condition interpreter on course with a lot of rules

OO-491: the activate catch the OLATSecurityException, the user which has a "wrong" business path is not responsible for it

OO-449: implements notifications for private message, download of log in course and group, archive of log by course deletion...

OO-449: refactor user session to work with identity key, make it pop, implements one to one chat, group chat, course chat, remove connect user list, refactor UserRequest to make it an interface

OO-449: first part of the implementation: remove smack libraries, refactor controller and unify them, implements messaging across the OpenOLAT event bus, implements administration part to enable chat...

OO-293: better back support in course (run), better switch between sites and dynamic tabs, better behavior after closing a tab (stack of previous tabs/sites not limited to 1 site)

OO-369: make an interface for the StackedController, add some translations, refactor the course db main panel

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

OO-302: implement CSS class to open the course editor in course, in test configuration and in the dialog to choose repository entries

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

FXOLAT-357: implements link abonnement to assessment tool, upgrade the publisher with the right business path

OO-170: refactoring of the property table, move efficiency statements and initial/recent launch dates to their own table