LDAP: Coypright info
LDAP: prepare settings for internal username attribute and clearing user mappings
LDAP: add settings for UUID override
LDAP: implement r+w for new settings
LDAP: better variable name
LDAP: implement UUID and internal username override
LDAP: Implement clear mappings functionality
LDAP: fix display of numerical display names
Merge branch 'backport_ldap_configurable_username_n_uuid' into stable5