Make method non-virtual

dune/tectonic/myblockproblem.hh

@@ -57,7 +57,7 @@ template <class MyConvexProblemTypeTEMPLATE> class MyBlockProblem {
         0); // safety: acceptance factor for inexact minimization
   }
 
-  std::string virtual getOutput(bool header = false) const {
+  std::string getOutput(bool header = false) const {
     // TODO: implement (not urgent)
     return std::string();
   }