THE FERRIS WHEEL SITS ON THE ROBERTO CLEMENTE BRIDGE. | PHOTO BY DAVE DICELLO Pittsburgh Downtown Partnership’s second Oktobefest is back. So is the Ferris wheel. This year’s festivities, which continue through Oct. 12, are taking place primarily on Fort Duquesne Boulevard, a change from last year’s location of Market Square. The Ferris wheel remains on the Roberto Clemente Bridge....