by Vera H-C Chan Celebrity miscreants, take a lesson from royalty: If you make your apologies quick, and head to another country where they like you, you may profit in the end. Less than a week after the Duchess of York got caught in an undercover tabloid sting selling access to her ex, Prince Andrew, Sarah Ferguson 's scheduled for a stop on "Oprah" right after Memorial Day. The reason for the visit is supposed to be to hawk her line of illustrated children's books,