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.

Fix deletion of metadata, fix left files by restore of versioned files,
implement restore of metadata of deleted versioned files, implements an
upgrader to delete metadata of deleted resources, courses, groups,
forums, users and temporary uploaded files

OO-3489, OO-3490, OO-3491, OO-3495, OO-3499, OO-3500, OO-3501: finish the export process, delete files after zipping, send email... and more exported data

OO-3489, OO-3492, OO-3493, OO-3494, OO-3496, OO-3497: infrastructure to export user data, export  portraits, notes, personal folder, calendars, subscriptions, delete calendars after usser deletion

OO-3477 remove username/email pseudo delete, refactor userdeletemanager to use more the userdatadeletable interface, remove all data from already deleted users

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-1873: replace the listing of booking by a native query optimized for our standard setup, replace the .hbm.xml with annotations, add more fetching overall

OO-1567: hardened the user name's cache against null, show a string as author if the feed author user name is null

OO-1483: implement a prewarm infrastructure to warm-up openolat caches, implement it for velocity templates, display names of users and QTI 2.1 resources

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

OO-887: cache the usernames in UserManager, decouple the AvatarMapper and make it search the username in the cache.

OO-809: fix the wrong equals for non-mysql database in findIdentiesByEmail (patch 1 of S. Clemenz), add unit tests

CL-220,OO-613: update search in repository tab to the new method, fix double optimization to retrieve the access control objects, fix the user name cache to prevent always searching non-existing usernames, fix RS in assessment tool caused by FULLY_PASSED property for Onyx

OO-622,CL-225: remove username from GUI in place where is not really needed and students can see it. Mark others place with //TODO username where it need more works and/or the username is only visible by author/coach/admin... Additional fix the setup sql for MySQL (index too long).

OO-586: import members by user names, emails and institutional numbers, remove select box, update wording