NIIGATA, Japan (AP) - To his Japanese neighbors, Lionel Dumont was a mystery. When police and immigration officials asked about the Frenchman, Dumont's landlord had no idea who he was, even though the landlord lived right across the street and had only 36 tenants in his apartment building. "They showed me a black-and-white picture and asked if I remembered him," Jubei Sato said. "I couldn't place him at all. I don't think I saw him once the whole three months he lived here. He blended right in, never caused any trouble. But I found out after he left that he'd...