message: Changing name from en_err to error
diff: @@ -125,14 +125,14 @@ void ConvergenceStudy::AddGf(GridFunction *gf, Coefficient *scalar_u,
  {
  double GradErr = gf->ComputeGradError(grad);
  DErrors.Append(GradErr);
  - double en_err =
  + double error =
  sqrt(L2Errors[counter-1]*L2Errors[counter-1]+GradErr*GradErr);
  - EnErrors.Append(en_err);
  + EnErrors.Append(error);
  // Compute the rate of convergence by:
  // rate = log (||u - u_h|| / ||u - u_{h/2}||)/log(2)
  double val = (dcounter) ? log(DErrors[dcounter-1]/GradErr)/log(2.0) : 0.0;
  double eval =
  - (dcounter) ? log(EnErrors[dcounter-1]/en_err)/log(2.0) : 0.0;
  + (dcounter) ? log(EnErrors[dcounter-1]/error)/log(2.0) : 0.0;
  DRates.Append(val);
  EnRates.Append(eval);
  CoeffDNorm = GetNorm(gf,nullptr,grad);
  @@ -177,14 +177,14 @@ void ConvergenceStudy::AddGf(GridFunction *gf, VectorCoefficient *vector_u,
  }
  if (derivative)
  {
  - double en_err = sqrt(L2Errors[counter-1]*L2Errors[counter-1] + DErr*DErr);
  + double error = sqrt(L2Errors[counter-1]*L2Errors[counter-1] + DErr*DErr);
  DErrors.Append(DErr);
  - EnErrors.Append(en_err);
  + EnErrors.Append(error);
  // Compute the rate of convergence by:
  // rate = log (||u - u_h|| / ||u - u_{h/2}||)/log(2)
  double val = (dcounter) ? log(DErrors[dcounter-1]/DErr)/log(2.0) : 0.0;
  double eval =
  - (dcounter) ? log(EnErrors[dcounter-1]/en_err)/log(2.0) : 0.0;
  + (dcounter) ? log(EnErrors[dcounter-1]/error)/log(2.0) : 0.0;
  DRates.Append(val);
  EnRates.Append(eval);
  dcounter++;
  