French prosecutors on Thursday demanded a 30-year jail sentence for a prisoner dubbed France's Hannibal Lecter , on trial for killing his cellmate and eating part of his lung.Nicolas Cocaign has admitted to beating and stabbing Thierry Baudry with a pair of scissors before smothering him with a rubbish bag in the prison in the northwestern city of Rouen in January 2007.The 39-year-old testified