New York Times: BP will begin replacing the cap on its runaway well in the Gulf of Mexico with a new one that has a tighter seal and could funnel all the oil spewing from the well to surface ships, the leader of the federal response effort said Friday. The leader, Thad W. Allen, a retired Coast Guard admiral, said at a briefing in New Orleans that perhaps as early as Saturday, technicians would remove the containment cap at the top of the failed blowout preventer, the giant stack of safety devices …