By Fatos Bytyci BAJAKOVO, Croatia (Reuters) - Croatia lifted a blockade on its border with Serbia on Friday, ending a week of trade war that had plunged relations between the two Balkan states to their lowest since Yugoslavia broke up in blood in the 1990s. A Reuters reporter on the scene confirmed cars with Serbian plates were now moving into Croatia. More than 60,000 migrants have crossed into Croatia from Serbia in the past week.