This episode's headline: School Vouchers; Megan's Law Pointed Exchange; Newsmaker; Dialogue. ANCHOR: JIM LEHRER; GUESTS: REP. RICHARD ARMEY, House Majority Leader; DEL. ELEANOR HOLMES NORTON, [D] District of Columbia; DR. DAVID SATCHER, Surgeon General; ROBERT SURO, Author, ""Strangers Among Us""; CORRESPONDENTS: ELIZABETH FARNSWORTH; BETTY ANN BOWSER;PHIL PONCE; KWAME HOLMAN; DAVID GERGEN