When you’re job hunting, you should target your application to each opening you aim for as assiduously as a dart player aims his darts at the bull’s-eye. Put another way: Hiring managers will probably reject a generic, untargeted application about as fast as you reject your junk mail — and for many of the same reasons. But they will probably give about as much attention to a targeted application — an extremely rare and valued commodity — as you would to a long-awaited letter that personally addresses you. Targeting tips: Your application should describe credentials that are required by your…