BY RENATA BRITO, ELAINE GANLEY AND SAMY MAGDY When Mbengue Nyimbilo Crepin regained consciousness after collapsing in the desert, the sun had already set. Tunisian authorities had violently forced him, his wife and their 6-year-old daughter across the border to Libya by foot without water, in the blazing heat, he said. Nyimbilo crumpled to the ground, exhausted and dehydrated, but urged his wife to carry on with little Marie and catch