Photo: Christoph Morlinghaus The clatter of helicopter blades echoed across the jungles of northwestern Ecuador. Antinarcotics commandos in three choppers peered at the mangroves below, scanning for any sign of activity. The police had received a tip that a gang of Colombian drug smugglers had set up a clandestine work site here, in a dense swamp 5 miles south of Colombia’s border. And whatever th