Penniless pornographer Al Goldstein has "screwed" up his life some more — after being caught shoplifting books from a Barnes & Nobles yesterday, police said. And they weren't even dirty books. Goldstein, 68, the ex-publisher of Screw Magazine, was stopped by security on his way out of the chain's Lincoln Center store at 1972 Broadway, with three books, a police source said. They were health books "including at least one on colitis," the source said. Goldstein was charged with petit larceny. His life has been spiraling downward the last couple of years. In March 2002, he was found guilty of...