This episode's headline: Welfare Reform. The guests include Dr. ARTHUR FLEMMING, National Coalition for Quality Integrated Education; ELLIOT RICHARDSON, Nixon HEW Secretary; ROBERT CARLESON, Special Assistant to Pres. Reagan. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; MONICA HOOSE, Producer; ANNETTE MILLER, Reporter