Fixed persistency bug with cache and con & ip tags.

        for login in to_register:

            conf = self.conf.show(login)

            obj = TqlObject(id=login, r=conf['role'], a=login)

            self.objects.register(obj, cleanable=('ip', 'con'))

            self.objects.register(obj)

        for login in to_unregister:

            self.objects.unregister(login)

        else:

            # The client is connected:

            if parent is None:

                obj.update(client.get_tags())

                serv_tags = client.get_tags()

                obj.update(serv_tags)

                # Add an infinite ttl to server defined tags:

                for tag in serv_tags:

                    self._ttls[(obj['id'], tag)] = datetime.max

            # First, check if each tag is not already cached:

            now = datetime.now()

        '''

        return self._objects[oid]

    def register(self, obj, cleanable=()):

    def register(self, obj):

        '''

        Populate the database with the specified object. All the tags specified

        in the passed object are not declared in cache and will never be

        cleaned.

        :param obj: the object to register

        :param clenable: the optionnal list of tags to declare as cleanable when

            the cache is cleaned

        '''

        with self._lock:

                raise AlreadyRegistered('The object is already registered')

            else:

                self._objects[obj['id']] = obj

                for tag in cleanable:

                    self._ttls[(obj['id'], tag)] = datetime.max

    def unregister(self, obj_id):

        '''