Ben Affleck obviously loves Boston, and Boston loves him right back when he sets a film there. When “Good Will Hunting” came out, Affleck and Matt Damon were hailed as multi-talented newcomers. Somewhere along the line, however, Damon became a superstar and Affleck became a joke (the “Bennifer” saga didn’t help). But then Affleck does something like “The Town” (2010), a moving film that seamlessly combines a love story with a heist flick and a warts-and-all ode to Boston’s Charlestown neighborhood. And then you rediscover Affleck, the leading man – and then you realize that maybe the joke was on you.