Chief Uncas’ Direct Descendant Directing Glimmerglass’ ‘Flute’ COOPERSTOWN – Last summer, Madeline Sayet visited Glimmerglass’ environs for the first time, hiking into the woods with designers Troy Hourie (sets) and Kaye Voyce (costumes). They came upon a clearing. “There must have been a fire,” said Sayet, who, a direct descendant of the Mohegans’ great chief Uncas, is as close to a Native American princess as anyone these days. “All the trees were isolated and singular. And we said: That’s Sarastro’s work. The…