The DAX barely moved at the start of the week. At the close of Xetra trading, the index stood at 26,323 points, a gain of just a few points compared to the previous trading day. The clear top performer on Monday was Qiagen. The diagnostics company's latest quarterly figures apparently convinced investors. "After the record-breaking run, investors in Frankfurt have become somewhat weary of summer and are approaching the new week accordingly," sai…