message: Fix SLI convergence measures (remove sqrt)
diff: @@ -279,7 +279,7 @@ void SLISolver::Mult(const Vector &b, Vector &x) const
  nom = sqrt(Dot(r, r));
  }
  - cf = sqrt(nom/nomold);
  + cf = nom/nomold;
  if (print_level == 1)
  mfem::out << " Iteration : " << setw(3) << i << " ||Br|| = "
  << nom << "\tConv. rate: " << cf << '\n';
  @@ -315,7 +315,7 @@ void SLISolver::Mult(const Vector &b, Vector &x) const
  if (print_level >= 1 || (print_level >= 0 && !converged))
  {
  mfem::out << "Average reduction factor = "
  - << pow (nom/nom0, 0.5/final_iter) << '\n';
  + << pow (nom/nom0, 1.0/final_iter) << '\n';
  }
  final_norm = nom;
  }
  