HOUSTON, Oct. 18 - Billions of dollars of Iraqi oil had been sold under a United Nations program - and food and other goods bought with the proceeds - when Saddam Hussein decided in 2000 that he personally wanted a bigger cut of the action. Documents now suggest that at least one United States company acceded to that demand, paying surcharges that kept the oil flowing. The action by the Coastal Corporation, which was founded by the Texas entrepreneur and oilman Oscar S. Wyatt Jr., is detailed in a formal Iraqi government tally of secret payments made from September 2000...