FIRE BROKE OUT Thursday in a Detroit apartment building for senior citizens, sending residents jumping out windows and leaving five people dead and at least a dozen injured . . . A SMALL EARTHQUAKE centered 6 miles north of Santa Cruz, Calif., jolted large numbers of residents awake but caused no injuries or damage, authorities said . . . LOUIS DIBONO, 63, A reputed member of the Gambino organized crime family was found slain execution-style in a Manhattan parking garage, police said. The body was found sprawled across the front seat of a 1987 Cadillac Thursday afternoon.