By Lucila Sigal BUENOS AIRES (Reuters) – Argentine army veteran Luis Poncetta has traveled twice to the Falkland Islands to pay tribute to comrades who fell in a 74-day conflict with British forces 40 years ago. The divisions, he has found, still linger. Argentina and Britain have long disputed the sovereignty of the British-run group of islands in the South Atlantic that Argentina knows as the Malvinas. In 1982, that erupted into a short war that claimed the lives of 650 Argentine soldiers and 255 British troops. The two countries now have cordial relations, although the islands remain a cons…