OO-446: optimize versions management, don't copy several times the same file, file upload of forums, add excluded folders in bcroot as forum, scorm... don't versioned CPs, implements maintenance tools

OO-464: check if the file has a high probability to be a versions file, catch the error if it's not case

OO-460: make the spring xml configuration easier to configure with the profile function of spring 3.1

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.