He is unshaven and unsteady, standing in the parking lot outside his darkened motel room, his black eyes surveying the brown Southern California hills.  His teammates, all white teeth and bulging calves, have finished their communal breakfast and greet one another with sunny good mornings.  On this February day, though, Mark Cavendish remains apart.  Jet-lagged after a flight from the Middle East, where he sprinted to two stage wins at the Tour of Qatar, the world's fastest cyclist is not happy, to be in California particular.