There is a new eatery in town and it is the most splendid addition to downtown Watertown with its menu of light, healthy, fresh lunch fare, its warm and welcoming ambience, and the ever so charming staff who greet every patron with a smile and an entire day’s worth of enthusiasm. The aptly christened Cornerstone Eatery opened its doors this summer on the corner of Franklin Street and Public Square where the humdrum ole Subway was once located. I have driven through Public Square about a million times and never was I once tempted to go grab lunch from that Subway. In the wake of its recent closing, some brilliant…