fixes #596. Added suggested patch

lib/Doctrine/Query/Abstract.php

@@ -104,6 +104,20 @@ abstract class Doctrine_Query_Abstract extends Doctrine_Hydrate
         return $this->parseQueryPart('where', $where, true);
     }
 
+    /**
+     * whereNotIn
+     * adds NOT IN condition to the query WHERE part
+     *
+     * @param string $expr          the operand of the NOT IN
+     * @param mixed $params         an array of parameters or a simple scalar
+     * @return Doctrine_Query
+     */
+
+    public function whereNotIn($expr, $params = array())
+    {
+        return $this->whereIn($expr, $params, true);
+    } 
+
     /**
      * addGroupBy
      * adds fields to the GROUP BY part of the query