BAGHDAD (Reuters) - The overall U.S. commander in Iraq, General David McKiernan, said on Friday U.S. troops planned to reduce the number of heavy and small arms in the hands of Iraqis as part of a drive to restore law and order.McKiernan said the plan, including am arms amnesty, would be implemented as soon as Washington approves the plan "within a matter of days."Iraqis are armed to the teeth and after the toppling of Saddam Hussein's government on April 9, looting of public and private institutions and homes swept the country and stolen weapons were sold on the streets...