PIGEON, MI (USA) - Since 2000, Huron County has lost factory jobs, paychecks and people, making unwanted news as one of Michigan's leading population losers. Heavy machinery moving earth near Pigeon, though, could help reverse the trend. Bulldozers preparing the soil for the new Blue Diamond Steel Casting LLC foundry - carrying up to 200 new jobs - ''shows there's a little bit of promise out there,'' said…