By JANIE HAR, Associated Press NOVATO, California (AP) — One woman in her 80s tripped over another resident who had fallen on the landing in a steep stairwell. Others got disoriented, even in their own apartments, and cried out for help. At least 20 seniors with wheelchairs and walkers were essentially trapped, in the dark, in a low-income apartment complex in Northern California during a two-day power