OO-798, OO-797, OO-796: update the webdav implementation based on Tomcat, make OpenOLAt work under root context, small refactoring of the dispatchers, push raw files dispatcher to its own servlet, implements Digest authentication...

OO-530,OO-537: as follow-up of the work in 8.3, remove some maps which are not really useful, remove more unused variables, remove the views and their mapping...

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-271: refactor the user session management, move the the logic in its own manager, persist the time out values, make the admin GUI a bit better

OO-101,OO-86: fix issues with concurrent requests from the same browser on /dmz/ which generate errors concurrent logoff/login...

OO-67: login via RESt doesn't logout the standard session in OpenOLAT, remove the identities cache in UserSession which wasn't used, remove the TemporaryDispatcher

FXOLAT-358: remove more unused classes and packages (SpringController, recorder i18n package, unused layouter)

--HG--
branch : bps