[2dGWF] Apply namespace changes.
[2dGWF] Remove debug code.
Using Element::_value as material property value.
[2dGWF] Using gml instead of gli files.
[2dGWF] For large tests: Output results to file.
[2dGWF] Realistic perm values for OGS-5 comparison.
[2dGWF] Moved declarations/implementations to own files.
WIP [2dGWF] ShapeMatrixIntializer: first version.
[2dGWF] WIP does not compile!