Kirk Douglas, the film great, producer and best-selling author who was one of the last links to Hollywood's Golden Age, died Wednesday in Beverly Hills, California. He was 103.   "It is with tremendous sadness that my brothers and I announce that Kirk Douglas left us today at the age of 103," his son Michael Douglas told People magazine. "To the world, he was a legend, an actor from the golden age of movies who lived well into his golden years, a humanitarian whose commitment to justice