ufz/ogs — pull request #449 by rinkk (2014-09-02 14:51:56+00:00)
Title: Radius edge quality metric for meshes

Implements the radius edge metric as a quality measurement for meshes (i.e. the ratio of the radius of the smallest sphere enclosing all nodes of a mesh element to the shortest edge of that element).
Basically this has all the advantages of the edge-ratio-metric and the equi-angle-skew-metric without any drawbacks that I am aware of.

I also use this PR to replace lots and lots of pointers in the metric classes with references.