NEW ORLEANS — Oil giant BP has agreed to pay the largest criminal penalty in U.S. history, totaling billions of dollars, for the 2010 oil spill in the Gulf of Mexico, a person familiar with the deal said Thursday. The person, who spoke on condition of anonymity because they were not authorized to speak on the record about the deal, also said two BP employees face manslaughter charges over the death of 11 people in the explosion of the Deepwater Horizon oil rig that triggered the massive spill. The person said BP will plead guilty to obstruction for lying to …