A French prisoner dubbed Hannibal Lecter was on Thursday sentenced to serve another 30 years in jail for killing his cellmate and devouring 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 38-year-old testified that he cut open Baudry's