CLEMENT UWIRIGIYAMANA A special U.N. tribunal in Tanzania should quickly try elderly tycoon Felicien Kabuga on charges of financing the 1994 Rwandan genocide, survivors said on Thursday, after France's top civil court ruled he could be handed over for prosecution. "The case of Kabuga should be speedy," Naphtal Ahishakiye, the executive secretary of genocide survivor organization Ibuka told Reuters by phone. He lost his parents and three brothers in the genocide. "He is elderly, I think a quick trial would enable the victims to get justice." But the tribunal in Tanzania's northern town of Arusha faces both legal challenges and…