Guy Lodge Film CriticIt’s been seven years since the Boston Marathon bombing put the Massachusetts capital in the headlines for all the wrong reasons, and beyond the odd bright flash of #BostonStrong graffiti on a shabby streetscape, it’s not discussed directly in “City Hall.” It doesn’t need to be: Its community-wide burden of grief, caution and a shared responsibility to rebuild is felt throughout Frederick Wiseman’s typically sprawling, inquisitive and inclusive anatomy of the city’s inner