NEW ORLEANS (Reuters) - Barely three years since being derided as a sorry parody of the franchise which once dominated the NFL, the San Francisco 49ers have a chance to claim a record-equaling sixth Super Bowl win on Sunday. It has been 18 years since the 49ers last appeared in a Super Bowl - their fifth victory coming against San Diego Chargers in Miami in 1994 - and in that time the franchise endured some poor seasons. ...