Tom Reney looks back at Duke Ellington’s “New Orleans Suite,” and the crucial role that Duke and festival producer George Wein played in the establishment of the New Orleans Jazz & Heritage Festival, which just completed its 49th annual presentation in the Crescent City. Wein’s insistence that any festival he produced would include Ellington, who “stayed only in the finest hotels,” and feature integrated ensembles was a spur to ending rigid segregation practices in New Orleans.