Force the nick name to be unique with a DB constraint, with an issue
where the user name for the OLAT token is the auto generated identity
name after changing the password

Adapt LDAP for auto/manual generated id. name, add unit tests for
special workflow (user which are created without authentication and get
LDAP token afterwards on login)

Prefer the email of the user to its user name for the change password
email if the user name is a number and email is allowed for login

Configuration and implementation to allow the users to request the
deletion of their account if they don't accept the disclaimer or in
their settings under the disclaimers.