This episode's headline: What Next?; African Views. ANCHOR: JIM LEHRER; GUESTS: CHINUA ACHEBE, Novelist/Playwright; NGUGI WA THIONG'O, Author/Playwright;MONDE MUYANGWA, National Summit on Africa; C. K. LADZEKPO, African Music & Dance Ensemble; KENNETH STARR; DAN BALZ, Washington Post; LAWRENCE WALSH, Iran-Contra Independent Counsel; ALEXIA MORRISON, Reagan-Era Independent Counsel; RICHARD BEN-VENISTE, Watergate Prosecutor; JONATHAN TURLEY, George Washington University Law School; CORRESPONDENTS: MARGARET WARNER; SPENCER MICHELS; ELIZABETH FARNSWORTH