Set default upwinding method to 'none'

doc/default_files/parameters.xml

@@ -425,7 +425,7 @@ adding an empty line, make text **bold** or ``monospaced``.
         **fullUpwind:** Apply upwinding on numeric flux and conductivity.
       </definition>
       <values> none, semiUpwind, fullUpwind </values>
-      <suggestion> semiUpwind </suggestion>
+      <suggestion> none </suggestion>
     </parameter>
 
     <parameter name="weights">

dune/dorie/solver/operator_DG.hh

@@ -184,7 +184,7 @@ public:
   RichardsDGSpatialOperator (const Dune::ParameterTree& config, const Parameter& param_, const GridView view_,
       Boundary& boundary_, const SourceTerm& sourceTerm_,
       RichardsDGMethod::Type method_ = RichardsDGMethod::SIPG,
-      RichardsDGUpwinding::Type upwinding_ = RichardsDGUpwinding::semiUpwind,
+      RichardsDGUpwinding::Type upwinding_ = RichardsDGUpwinding::none,
       RichardsDGWeights::Type weights_ = RichardsDGWeights::weightsOn,
       int intorderadd_ = 2, int quadrature_factor_ = 2)
     : Dune::PDELab::NumericalJacobianVolume<RichardsDGSpatialOperator<Traits,Parameter,Boundary,SourceTerm,FEM,adjoint> >(1.e-7),