* Dollar stays buoyed as Europe's debt worries persist. * Euro, commodity currencies nurse last week's losses. * EU summit in focus, markets fear more disappointment. Currency markets got off to a subdued start on Monday, with the safe-haven U.S. dollar holding on to most of last week's gains ahead of another European summit that could take the region a step closer to containing its debt crisis. The dollar index, which rallied some 1-percent last week, was at 82.358, not far off a peak of 82.469 set on Friday. Against the yen, the greenback edged up to a two-month high at 80.63 versus 88.44 late in New York on ... (full story)