fix attribute lists for LDAP queries LDAP does not know of an attribute named 'dn'. To get only the DN in a search, the attriibute list to use is '1.1'. On all other cases, the DN of the entries found is automaticlly part of the result set too.

remove now unused parent_dn() method

cd: flexible treatment of repeated '..', even as prefix Treat '..' as any shell does: - while the path given starts with '..', strip away the first element of the current base DN - use ',' as separator - if anything remains in thep ath given, prepend it to the stripped down baseDN - use the result as the new base DN