Adapt calendar web service to not use the identity name, add a new user
authentications web service based on identity key, remove the advanced
properties controller

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.