Real estate agents are famous for putting a listing in the best possible light to close a sale. On Thursday, the industry's national trade association confirmed that its monthly data have been painting a rosier picture of the pace of home sales since 2007. As msnbc.com reported in March, the National Association of Realtors has been overstating the pace of existing home sales by more than 16 percent. The trade group now says just 17.7 million existing homes were sold from 2007 to 2010, not the 20.6 million it originally reported. The NAR made no changes to its data on...