European stocks rallied to their highest levels in months after the German Constitutional Court allowed Germany to support the eurozone's new 700-billion-euro bailout fund to help resolve the zone's debt crisis. The euro's strength against the dollar also boosted gains for investments there denominated in greenbacks. Global X FTSE Greece 20 ETF (GREK), up 5.6%, outperformed all stock ETFs, rising to its highest price in nearly six months. It's