Adams Morgan mainstay closing For over 15 years, San Marco has been an Italian mainstay in Adams Morgan. It had long been rumored that it would close, but tomorrow night they will be closing their doors for good. So stop by for a last plate of lasagna and wish owners Pino Mele and Roberto Massarin well. Dish of the Week: Blue crabs I’m a little crab obsessed, and I know soft shells have been the…