* Marc/ticket/11842:
[ticket/11842] Add functional test for creating group
[ticket/11842] Use avatar_data for obtaining driver that should be deleted
[ticket/11842] Use type map for updating avatar types in database
[ticket/11842] Add missing prefix for group id in avatar data
[ticket/11842] Use only new avatar type in user_delete function
[ticket/11842] Add migration file for updating avatar type in database
[ticket/11842] Replace outdated occurences of user and group avatar_type
[ticket/11842] Use group_id 0 and correct avatar name after creating group