When Joan Crawford saw The Shining Hour on the Broadway stage, she pleaded with M-G-M executives to let her spread her acting wings in the film version. Ms. Crawford got her way, playing a New York siren who marries a prosperous farmer (Melvyn Douglas) and moves to Wisconsin. There she is drawn to his handsome brother (Robert Young), even as she befriends the brother's selfless wife (Margaret Sullavan, Crawford's choice for the role). T