Merge branch 'remove-output-from-mass-conserve-test' into 'master'

Remove output of mass conservation test

See merge request !74

(cherry picked from commit 7f1d982e)

dune/dorie/test/test-mass-conservation.hh

@@ -263,9 +263,6 @@ public:
    */
   double run_test()
   {
-    const auto t_start = this->controller->getTime();
-    this->output->write_vtk_output(t_start);
-
     double acc{0.0};        // accumulated deviation
     double acc_square{0.0}; // accumulated squared deviation
 
@@ -301,8 +298,6 @@ public:
       std::cout << "wc_new: " << wc_new << std::endl;
       std::cout << "integrated flux: " << flux_int << std::endl;
       std::cout << "deviation: " << deviation << std::endl;
-
-      this->output->write_vtk_output(this->controller->getTime());
     }
 
     std::cout << "total deviation: " << acc << std::endl;