AT THE MOVIES, Sylvester Stallone clings to his fading superstardom in Cliffhanger, the week’s No. 2 movie. ON TV, ah, those were the days: ABC’s strong roster of sitcoms–Roseanne, Home Improvement, and Coach–make the net a Nielsen winner. IN MUSIC, Janet Jackson’s janet (left) debuts at No. 1 on the Billboard album chart, while her six-week-old “That’s the Way Love Goes” is the top single. AND IN THE NEWS, in the Clinton administration’s first combat mission, U.S. forces strike areas in Mogadishu, Somalia, controlled by warlord Mohammed Farah Aidid.