The flow allow to initiator controller to redraw its content after the
click of the link and before sending the URL of the new window.

Login happens only with authentication informations, identity name is
now only used for legacy directory name. User name of authentication can
be changed. LDAP users can be imported with LDAP::ldapUid. Users can be
imported in courses, groups... with First name last name.

Show a warning in test, test part and sections if the number of max.
attempts is overwritten by under elements

Use an unique instance of the test session controller for every window
where a user has started a test. Theoretically, the user can now work on
the test from several different windows (with some restrictions).

Save the questions copied from pool in their own private directory and
allow to copy such questions in the editor.