It's that time of year. It's warm, it's sunny, and it's not too humid yet. Barbecuing seems the perfect way pass a Sunday; a front-stoop beer is the perfect end to a long of work. It's the time of year, in other words, when the leafy blocks of brownstone Brooklyn start looking utterly enticing, even to many dedicated Manhattanites. But wait! Are things really as peaceful and tranquil on those blocks as they seem? Perhaps not. This week's Brooklyn Papers report some shocking news: