The Wall Street Journal is reporting that the number of homes listed for sale has declined in many U.S. cities in November, reversing a strongly negative trend. In the 27 metropolitan areas covered in the ZipRealty survey, housing inventory dropped by an average of 28% over the last year and 2.4% during the last month. In Austin, the number of home listings slid by 19.8 percent over the last year and 3 percent between October and November.The slide in inventory . . .