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.

Add quota of concurrent meetings per template, add informations while
selecting a template, check server availability, show the template of
the meeting in admin./edit table, permanent meeting can be disabled,
dates of non-permanent meeting are strictly observed and mandatory,
duration of meeting is exact (+ 1 minute)...