AMGStep: do not use deprecated constructor

dune/solvers/iterationsteps/amgstep.hh

@@ -49,7 +49,7 @@ public:
         setProblem(*stiffnessMatrix, x, rhs);
 
         fop_ = std::unique_ptr<Operator>(new Operator(*stiffnessMatrix));
-        amg_ = std::unique_ptr<AMG>(new AMG(*fop_, coarseningCriterion, smootherArgs, 1, 1, 1, false));
+        amg_ = std::unique_ptr<AMG>(new AMG(*fop_, coarseningCriterion, smootherArgs));
         amg_->pre(*this->x_, residual_);
     }
 
@@ -94,12 +94,21 @@ private:
     std::unique_ptr<AMG> amg_;
 
     VectorType residual_;
+
+    void setupCoarseningCriterion()
+        {
+            coarseningCriterion_.setNoPreSmoothSteps(1);
+            coarseningCriterion_.setNoPostSmoothSteps(1);
+            coarseningCriterion_.setGamma(1);
+            coarseningCriterion_.setAdditive(false);
+        }
 };
 
 template <class MatrixType, class VectorType>
 void AMGStep<MatrixType,VectorType>::preprocess()
 {
-    amg_ = std::unique_ptr<AMG>(new AMG(*fop_, coarseningCriterion_, smootherArgs_, 1, 1, 1, false));
+    setupCoarseningCriterion();
+    amg_ = std::unique_ptr<AMG>(new AMG(*fop_, coarseningCriterion_, smootherArgs_));
     amg_->pre(*this->x_, residual_);
 }