By Kaylee Greenlee Beal, Kristina Cooke and Mica Rosenberg SAN ANTONIO (Reuters) -The bodies of 46 dead migrants were discovered inside a tractor-trailer on Monday in San Antonio, Texas, city officials said, in one of the most deadly recent incidents of human smuggling along the U.S.-Mexico border. A San Antonio Fire Department official said they found “stacks of bodies” and no signs of water in the truck, which was found next to railroad tracks in a remote area on the city’s southern outskirts. Sixteen other people found inside the trailer were transported to hospitals for heat stroke and exh…