HARARE (Reuters) - Zimbabwe s incoming president Emmerson Mnangagwa has called on  citizens to remain peaceful and desist from any form of  vengeful retribution , days after Robert Mugabe resigned from power. Mnangagwa s supporters were angered by his dismissal early this month, a move that triggered the military to intervene. Some of the supporters have been calling for unspecified action against the G40 group that backed Mugabe and his wife. 