In the days when Hollywood films were being cranked out by the big studios the way Detroit turned out automobiles, one man clung to the belief that a motion picture was like a painting which had to be painted and signed by a single artist.In 1939 David O. Selznick justified his belief. He was 37 years old when Gone With the Wind was released to thunderous accolades. It was the triumph -- and the tragedy -- of his life. As a producer he had reached...