text: Aide: Al-Sistani Brokers Najaf Peace Deal NAJAF, Iraq - Rebel cleric Muqtada al-Sadr agreed Thursday to a peace deal presented by top Shiite cleric Grand Ayatollah Ali Husseini al-Sistani to end three weeks of fighting in the holy city of Najaf, according to a top aide to al-Sistani.    Al-Sistani, the most influential cleric among Iraq's Shiite majority, reached the deal in direct talks with al-Sadr in the evening, only hours after making a dramatic return to Najaf...