RealtyTrack has reported a generally downward trend in foreclosure filings since last fall, but the monthly variations tended to mask the magnitude of the trajectory. The mid-year report, released on Thursday, solidifies the impression of an improving situation. Foreclosure filings nationwide were down 29 percent during the first half of 2011 compared to the last half of 2010 and were 25 percent lower than filings during the first half of last year. Still, the numbers are still depressing; one in...