Exchange troubled cell

Some more features for LimitPass.

dune/fem-dg/algorithm/sub/evolution.hh

@@ -299,11 +299,14 @@ namespace Fem
 
 #ifdef BASEFUNCTIONSET_CODEGEN_GENERATE
       {
-        const int maxOrder = 2*solution().space().order() ;
+        const int polOrder = solution().space().order();
+        const int maxOrder = 2 * polOrder + 1 ;
+        const int dim = GridType :: dimension;
         std::vector< int > quadOrder( maxOrder );
         for( int i=2; i<maxOrder+2; ++i )
           quadOrder.push_back( i );
-        Dune::Fem::generateCode( solution().space(), quadOrder, quadOrder );
+        std::string filename( "autogeneratedcode_"+std::to_string( dim ) + "d_k" + std::to_string( polOrder ) + ".hh" );
+        Dune::Fem::generateCode( solution().space(), quadOrder, quadOrder, "./", filename );
 
       }
 #endif