A protester was killed in Sudan Tuesday, medics said, as pro-democracy demonstrators marked the first anniversary of a coup that derailed a transition to civilian rule. Waving Sudanese flags, thousands of protesters in Khartoum and its suburbs defied security forces who have carried out deadly crackdowns on past rallies, demanding that “soldiers go back to the barracks”. Security forces responded with tear gas in some areas. “No partnership, no negotiation with the putschists,” protesters chanted, in what has become a pro-democracy rallying cry. In Omdurman, across the Nile from Khartoum, a de…