[ldap] fix email synchronization code: bad rql query + avoid integrity error on creating the address + nicer use_email / primary_email handling
"""this contains the cube-specific entities' classes
:organization: Logilab
:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""