By CHRIS STEWART Good enough to eat: Chris ate like a king in the Provence town of MoustiersIf you've never been to Provence, it will be familiar to you in one way or another: you've read Peter Mayle's books or seen Jean De Florette; you will have drooled perhaps over improbable images of lavender fields; and, of course, you have been transported to a cafe in Arles or a starry night on the Rhone