Last night an ancient one, barely able to walk shuffled across the wet sidewalk to the front door of Nightwatch. His cab ride was paid for by an exasperated hospital social worker. The hospital didn’t want him. The shelters are all full. The boarding house with cheap rent is torn down. He has no friend to call. No loving wife or sister or daughter with a couch, for a night or two. He has only the gray-wool blanket given to…