Do you know Jill Flint? How about Jill Casey? I've got to say, I didn't know either of them until about a half hour ago. They're actually the same person, because Ms. Casey plays Jill Flint on the USAnetwork cable series, Royal Pains. A show about doctors practicing in the Hamptons, New York's elegant coastal community.It sounds like the requested golf wardrobe should be pleasingly preppy, after