make StandardProblemIteration copyable

src/amdis/ProblemStat.hpp

@@ -49,7 +49,7 @@ namespace AMDiS
   template <class Traits>
   class ProblemStat
       : public ProblemStatBase
-      , public StandardProblemIteration
+      , public StandardProblemIterationAdaptor<ProblemStat<Traits>>
   {
     using Self = ProblemStat;
 
@@ -81,8 +81,7 @@ namespace AMDiS
      * access values corresponding to this problem in the parameter file.
      **/
     explicit ProblemStat(std::string const& name)
-      : StandardProblemIteration(dynamic_cast<ProblemStatBase&>(*this))
-      , name_(name)
+      : name_(name)
     {}
 
     /// Constructor taking additionally a reference to a grid that is used