Image from Flickr user DJ Durutti Boston is the greatest place in the country to spend Independence Day. It's the historical center of America, the place where it all happened, the site of the greatest fireworks, yar yar yar, blah blah blah. You're here; you know this. But is there anything you don't know about Independence Day in and around Boston? We're trying to find that out. The Globe covers tired--'scuse us, "tried"--and true......