SAUL LOEB / Getty Images Long-term interest rates reversed their backslide a bit on Friday, as traders got a bit less gloomy about potential cracks in the banking system forcing the Federal Reserve to cut interest rates a bit more than planned. The yield on the benchmark 10-year U.S. Treasury rate, which helps drive borrowing costs on mortgages, climbed back above 4% on Friday. It had breached that mark on Thursday, when it closed at 3.97%, and had been sliding again earlier on Friday before closing above ...