2pdfm: replaced the ArtMeshReader by a ArtGridCreator which is conform with the

other GridCreators in Dumux. As a consequence, it is now possible to
have a standard Dumux cc-file calling the Dumux start routine.

The FractureMapper is now placed directly into the SpatialParams and not
tunnelled through the problem anymore. Moreover, there are numerous
naming and style changes to make it more Dumux-conforming.

Reviewed by Christoph.


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@9676 2fb0f335-1f38-0410-981e-8018bf24f1b0