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.

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).

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improvements