The American Jazz riverboat, which ran aground near Canton, Kentucky on July 8 with 120 passengers and six crewmembers aboard, has finally been set free.The Lake Barkley Grounding Unified Command freed the riverboat, American Jazz, Friday from Lake Barkley in Cadiz, the U.S. Coast Guard said Saturday.At 3:22 p.m., salvage crews and the riverboat crew were able to free the riverboat from being ground by using a combination of a tug and barge setup along with the ship’s propulsion."Thanks to the amazing support of American Cruise Lines…