This episode's headline: Simpler Taxes. The guests include Sen. ROBERT DOLE, Republican, Kansas; In Nebraska (Facilities: Nebraska Educational Television Network): Rep. RICHARD GEPHARDT, Democrat, Missouri. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; KENNETH WITTY, Producer; GORDON EARLE, JOE QUINLAN, Reporters