If Boston’s Fenway Park is, as advertised, America’s “most beloved” baseball venue, it’d have to be affection of the warts-and-all variety.  For sheer beauty, you’d have to go with Fenway’s only plausible competition for the title of most beloved: Chicago’s Wrigley Field, with its elegant, jewel-box design and ivy-covered outfield walls.  Fenway, on the other…