Living apart trom his wife. Began affair with Nora Ephron, Esquire columnist, in New York while her husband, Dan Greenburg, book author, was at EST, Erhard Seminar Training. Woodward, Bob: A loner. Clean as a hound’ s tooth. So far. Then | began to “chop the coke,” as they say, with a razor blade. When Bob Haldeman ent