message: Change BICGStabSolver print level semantics.
diff: @@ -1275,7 +1275,7 @@ void BiCGSTABSolver::Mult(const Vector &b, Vector &x) const
  resid = Norm(r);
  MFEM_ASSERT(IsFinite(resid), "resid = " << resid);
  - if (print_level >= 0)
  + if (print_level >= 1)
  mfem::out << " Iteration : " << setw(3) << 0
  << " ||r|| = " << resid << '\n';
  @@ -1296,7 +1296,7 @@ void BiCGSTABSolver::Mult(const Vector &b, Vector &x) const
  rho_1 = Dot(rtilde, r);
  if (rho_1 == 0)
  {
  - if (print_level >= 0)
  + if (print_level >= 1)
  mfem::out << " Iteration : " << setw(3) << i
  << " ||r|| = " << resid << '\n';
  @@ -1333,7 +1333,7 @@ void BiCGSTABSolver::Mult(const Vector &b, Vector &x) const
  if (resid < tol_goal)
  {
  x.Add(alpha, phat); // x = x + alpha * phat
  - if (print_level >= 0)
  + if (print_level >= 1)
  mfem::out << " Iteration : " << setw(3) << i
  << " ||s|| = " << resid << '\n';
  final_norm = resid;
  @@ -1341,7 +1341,7 @@ void BiCGSTABSolver::Mult(const Vector &b, Vector &x) const
  converged = 1;
  return;
  }
  - if (print_level >= 0)
  + if (print_level >= 1)
  mfem::out << " Iteration : " << setw(3) << i
  << " ||s|| = " << resid;
  Monitor(i, resid, r, x);
  @@ -1362,7 +1362,7 @@ void BiCGSTABSolver::Mult(const Vector &b, Vector &x) const
  rho_2 = rho_1;
  resid = Norm(r);
  MFEM_ASSERT(IsFinite(resid), "resid = " << resid);
  - if (print_level >= 0)
  + if (print_level >= 1)
  {
  mfem::out << " ||r|| = " << resid << '\n';
  }
  