HAVANA - In the Alamar neighborhood on the outskirts of Havana, the streets don't have names. To find an address, you need to know the zone, the block number and the apartment, because all the buildings look the same. Long and rectangular, five stories tall, their facades have been stripped by the ocean air and re-pigmented in curlicue patterns of mildew. Alamar is the largest public housing project in Cuba, if not one of the largest in the world, with 100,000 residents. In a country sworn to socialist equality, it is arguably Cuba’s most equal place, because everyone pretty much...