MADRID | Barclays Capital made a realistic yet not Armageddon-like exercise in which the Spanish banking sector would need a recapitalisation equivalent to 6 percent of the country’s GDP, plus an additional 5.4 percent of GDP as an extra-safety calculation. Its analysts threw in 0.9 percent of GDP in Greek liabilities, and 3.5 percent of GDP in administrations’ accumulated debt payments. The scenario considered included yields on 10-year bonds of…