AT LEAST FIVE people drowned Friday when a boat loaded with more than 70 Dominicans capsized and sank in rough seas off the west coast of Puerto Rico, officials said. . . . NASA GOT READY to begin its second shuttle countdown in 21/2 weeks Saturday, this time for Discovery and its crew of seven men who will conduct "Star Wars" research for the Pentagon. The countdown clock was to begin ticking 8:45 a.m. Saturday. . . . A SUSPECT in a shooting opened fire on law officers who confronted him on a Webster, Wis., street Friday, killing an investigator and wounding a sheriff's deputy before dying in a hail of police bullets.