AFRICAN MIRROR REPORTER The African Union (AU) has asked all Africans to rally behind Nigerian Dr Nkonzo Okonjo-Iweala, who stands on the brink of making history as the first African to head the World Trade Organisation (WTO). AU chairperson and South African President Cyril Ramaphosa has heaped praise on Dr Nkonzo Okonjo-Iweala who together with South Korean Yoo Myung-hee are the two finalists for the position of the director-general of the WTO. Ramaphosa said Okonjo-Iweala was a highly distinguished African, who has excelled in various public offices, in her native Nigeria, including responsibilities in the AU, and in numerous international…