Mrs. Clinton Is Forgiven, but for a PriceBy JOYCE PURNICK URING her big book party at the Four Seasons on Monday, Hillary Rodham Clinton was asked if she found it painful to relive her rough marital days. "It was difficult," she said. "It, you know, they were very difficult times; they should have remained personal and private matters. But they were pulled into the public so I felt I had to, you know, write about what was part of the public history." She got that right. She did have to. Those are the rules, unwritten but unyielding. New York's junior...