Now that Wisconsin allows people to carry concealed guns, here's one thing you might want to know: That includes your home. That means that everyone from the Mary Kay lady to the plumber can come into your home packing heat, unless you tell them they can't, or unless you post a sign. The law, which allows people to apply for licenses to carry concealed guns, knives, Tasers and billy clubs, went into effect on Nov. 1. People who oppose the law -- according to some polls they make up the majority of the state -- might be put off at...