Calculates the maximum element edge length, volume and quality factor. The maximum values are stored at nodes. So far the quality is only calculated for tets. Second order elements are treatened as linear regarding length and quality. The quality measure used is proportional to the ratio of the longest edge divided by the radius of the inscribed sphere. The proportionality constant is such that the quality is 1 for an equilateral tetrahedron. For all other elements it exceeds 1. The bigger this number, the worse the quality.