This episode's headline: Immigration Reform. The guests include MUZAFFAR CHISTI, International Ladies Garment Workers Union; ROGER CONNER, Federation for American Immigration Reform; Rep. BILL RICHARDSON, Democrat, New Mexico; . Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JOE QUINLAN, Producer; NANCY NICHOLS, Reporter