[bugfix] fixed issue where raster to mesh conversion would fail if all all intensity values were negative

Cleanup

Radius edge quality metric for meshes

This is required for an upcoming application.
It was already discussed in #89 and will come up
with more changes as the application grows. So
step by step all #includes will have the full
paths prepended.

Minimal bounding spheres for points

New tool "replaceMaterialID"

Executable testing and test data integration

XML numeric file reader

URL to Jenkins has changed as well.