* Euro barely above 4-month low, still vulnerable. * Greek banks face funding needs, add pressure on euro. The euro inched up on Thursday after plunging to a four-month low the day before, as some Greek banks faced emergency funding needs, compounding fears that the country's exit from the euro may put more pressure on other struggling European nations. The common currency fetched $1.2740, up 0.2 percent on the day, but was still within shouting distance of its four-month low at 1.2681 plumbed the day before. It has already shed 4.1 percent in May, coming close to its 2012 trough of 1.2624. Contagion fears and ... (full story)