MAY DECEMBER reviewed by GREG KING Director: Todd Haynes Stars: Natalie Portman, Julianne Moore, Charles Melton, Chris Tenzis, Gabriel Chung, Elizabeth Yu, Kelvin Han Yee. This richly layered, melodramatic but deliberately ambiguous character study from director Todd Haynes (Far From Heaven, etc) is inspired by the real-life case of Mary Kay Letourneau, a 34-year-old schoolteacher who was convicted of …