VATICAN CITY (CNS) -- The official discouragement of priests celebrating Mass in St. Peter's Basilica using the pre-Vatican II rite has ended, a Vatican official said. An English Benedictine, Father Andrew Southwell, announced he would celebrate Mass in St. Peter's May 23 using the old rite, setting off news reports that he would be the first priest to do so in more than 20 years. However, a Vatican official said over the years some priests surreptitiously celebrated the old Mass, checking in with the sacristy, going to an assigned altar with the new Missal, "then pulling the old one out...