OO-457: refactor tmp folder in OpenOLAT, use the java.io.tmpdir for all temporary files, configuration for absolute path for the indexer, fix deletion of temporary files in some archives, move qtieditor from tmp

OO-459: add the display name of a course in the list of subscriptions  for infomessage notifications

OO-452: allow to set several times the role in the user session if and only if the roles share the same permissions

OO-451: set the language just after the authentication and the login interceptors controller will use the user's prefered language.

OO-445: make the date in "Home > Subscriptions" mandatory and don't retrieve the news if there isn't a date.

OO-291: change the behavior of the buttons in "User admin > User > Groups > Add to groups". The search is activated by enter in the popup but not in the wizard

OO-433,OO-441: optimize data retrieval, save default values of properties which doesn't exist, check if the table controller is not disposed after loading start the data

OO-443: decrease level of the log to debug. If a user has not access to a resource, it's not an error