Load the new objectclass to link Samba's objects with OpenLDAP objects
Retrieve by default the objectGUID and entryUUID fields on LDB and OpenLDAP
Discard the Net::LDAP::Entry object and force a refresh if it's missing the entryUUID (OpenLDAP) or objectGUID (SAMBA) attribute
Fixed a typo
Added _linkWithUsersEntry && _linkWithUsersObject and called for every Samba object created from the users module, so we have a direct link between objects.