The public ceremony was held under a white canopy and a gray sky in the middle of a blighted and abandoned apartment complex in Binghampton, But Mary Williams was dressed like she was going to church.  The mayor spoke, as did the developer and the general contractor and the man in charge of housing and community development and the woman in charge of community redevelopment.  Williams, who lives in a quiet little apartment about two blocks east, shifted in her folding chair, waiting for officials to stop talking and excavators to start moving. It was demolition day in Binghampton. Again. The 100-year-old neighborhood in the middle of Memphis always seems to be under construction.  “I’ve been praying for this day,”...