When the black SUV crested the hill and stopped near a cluster of low buildings in the desolate Rwandan village of Rwinkwavu, a crowd of people cheered and the cameras started to roll. Showtime. Paul Kagame, the tall, cave-chested President of Rwanda, alighted from the driver's seat, and Bill Clinton, thinner than he used to be and ruddy in a brightly checked shirt, emerged from the passenger's
