IF THESE WALLS COULD TALK is a powerful, intimate portrait of how times and freedoms have changed, It will shock you. It will surprise you. And no matter where you stand on the issue, it will force you to think again. A recently widowed nurse (Demi Moore) struggling to take control of her life in the early 50's. A mother of four (Sissy Spacek) overwhelmed by trying to raise a family and maintain a career in the 70's. A young student (An