The nonprofit's activities are being well-received by the people in an area south of most of the violence 11/23/03 JEFFREY KOSSEFF Mercy Corps aid workers in Iraq have survived explosions near their homes and gunshot warnings as they drove between cities. They know the nation contains Iraqi insurgents eager to stop reconstruction and return control to the Baathists. They see other nonprofit humanitarian groups pulling out quickly as bombings and violence continue throughout the nation. But Portland-based Mercy Corps is staying put in southern Iraq, helping communities rebuild their schools, sewage systems and hospitals. The 25 workers, from the United...