SOUTH AFRICA's government lifted a controversial nightly curfew in all remaining black townships Friday after the wave of factional violence that prompted the measure subsided. . . . CALIFORNIA GOV. George Deukmejian ordered a "gay flag" removed from the state Capitol, saying the banner had been mistakenly hoisted. . . . BIG-BAND LEADER Xavier Cugat has been placed on a respirator three days after his admission to a hospital for heart and lung trouble, his doctors said.