LONDON/MADRID | Ratings agency Standard & Poor's had already added an injection of €80 billion to €120 billion of public money into the banking sector when it downgraded Spain last April 26 to BBB+ with negative outlook. The agency stated this week that even using the total amount of €100 billion, the country's debt per GDP ratio would be 76.6 percent in 2014. S&P said there would be no further…