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

OO-291: implement the popup to manage the areas in a course, add first draft of the rights management

OO-291: implement the wizards to import/choose new member for courses, implement a flexi version of the suer search, implements a flexi version of the auto completer