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

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.

OO-2429: move the foreign key from identity to user, remove double mapping of identity, add more unit tests for invitation, unify the methods to create the user and identity

OO-2241: remove optimized getter access to user properties, remove stupid unit test, change unit tests with the !keePEmail option

OO-932: upgrade Hibernate to 4.3, Infinispan to 6.0.1 , change the mapping of UserImpl (properties is a keyword) ...

--HG--
branch : bps