By THE ASSOCIATED PRESS BAGHDAD, Iraq The US administrator for Iraq wept at a farewell ceremony for Sergio Vieira de Mello Friday as the body of the United Nations' top diplomat to Iraq was loaded onto a Brazilian air force jet bound for Geneva, en route to Brazil. Vieira de Mello was killed in a suicide truck bombing attack on UN headquarters Tuesday that killed at least 22 other people and left more than 100 injured. His coffin, draped in a UN flag, was loaded onto the back of the jet by six pallbearers, including his bodyguards, accompanied by two...