In Havana, the past year has been marked by a parade of bold-faced names from the north — John Kerry reopening the United States Embassy; Andrew Cuomo bringing a delegation of American business leaders; celebrities ranging from Joe Torre, traveling on behalf of Major League Baseball to oversee an exhibition game between the Tampa Bay Rays and the Cuban national team, to Jimmy Buffett, said to be considering opening one of his Margaritaville restaurants there. All this culminated with a three-day trip in March by Barack Obama, the first American president to visit Cuba since Calvin Coolidge in 1928. But…