NOUAKCHOTT, Mauritania, AP- Mauritania''s self-declared head of state on Sunday named a new prime minister to replace the former premier who resigned along with his Cabinet after last week''s coup. A judge freed 21 people who had been detained for plotting against the ousted regime, a U.S. ally. Junta leader Col. Ely Ould Mohamed Vall named Sidi Mohamed Ould Boubacar as prime minister, the government said in a statement. The 49-year-old Boubacar returned to Mauritania on Saturday from France, where he had been serving as ambassador since 2004. The appointment followed the resignation earlier Sunday of former Prime Minister Sghair...