BOSTON - The neighbor who found Joan Bennett Kennedy lying on a sidewalk this week said she had no idea the woman she helped was a member of one of America's best-known families. Kennedy, 68, the former wife of U.S. Sen. Edward M. Kennedy, was recovering Thursday at Massachusetts General Hospital after suffering a concussion and broken shoulder. It remained unclear exactly what happened to Kennedy, who has battled alcoholism for years. There was an ambulance call record but no police report on the incident and family members have declined to give any details. Constance Bacon, 35, who lives in...