AT HOMEIn October 1979, Pope John Paul II came to the Boston Common. Susan Kandel was there taking pictures of families whod come to see him, carrying on with work she had started months earlier photographing families at Revere Beach. Among the people she photographed that day on the Common were two women and the five children theyd brought with them. They told Kandel that she should come take pictures at their homes, since they had younger kids who hadnt