ONAQUAGA REDISCOVERED • PART I Native Fled Iroquois HQ Year Before Dam Blew Up By JIM KEVLIN • Special to www.AllOTSEGO.com COOPERSTOWN – The more than 3,000 paddlers in this weekend’s 59th annual General Clinton Regatta can compete with a clear conscience. Its namesake Gen. James Clinton, who blew up the dam at Cooperstown in 1779 so the waters could carry his 200-bateaux flotilla swiftly down the Susquehanna to Onaquaga, didn’t destroy the Iroquois village there. He found one building…