PORTSMOUTH, England (Reuters) - The flagship of Britain's Navy, the aircraft carrier Ark Royal, set sail on Saturday for possible war in Iraq at the head of the largest UK amphibious task force deployed since the 1982 Falklands War. As flag-waving relatives and wellwishers packed the quayside, the carrier steamed out of Britain's Portsmouth harbor in chilly sunshine shortly after noon. "I'm proud of him but still wish he wasn't in there," Felicity Devine, whose 26-year-old son Brad works on the Ark Royal's communications, told Reuters as she watched. "You have to give them a bit of moral support," said...