DUKE OF SLUR It took Buckingham Palace less than three hours to issue an apology after the Duke of Edinburgh, touring an electronics company, said a fuse box looked like it was "put in by an Indian." The palace has had practice. Some of the Duke's bons mots:
--To a student who was in Papua New Guinea last year: "You didn't manage to get eaten then?"
--In 1995, to a Scottish driving instructor: "How do you keep the natives off the booze long enough to pass the test?"
--In 1993, in Hungary: "You can't have been here that long; you haven't...