letely without merit.Melville Mel Shavelson, who wrote, directed and produced dozens of films with such stars as Lucille Ball, Jimmy Cagney and Frank Sinatra and was twice nominated for Academy Awards, died Wednesday at age 90.Shavelson died at his Studio City home of natural causes, family spokesman Warren Cowen said.Shavelson worked as a gag writer for Bob Hope's radio show in the 1930s befor