It was a year of storms, of raging winds and rising waters, but also broader turbulence that strained our moorings. Our atmosphere, our politics, our economy — rarely in memory have they seemed in such constant agitation.Our emotions, too. In the year’s final weeks, amid a torrent of tears in a heartbroken Connecticut town, a rush of grief seemed to wash over all of us from the shooting deaths of 20 children and six adults in an elementary school, and of the shooter’s mother in her home.