message: reverting change in GradToCurl. To be handled by the CurlIntegrators PR
diff: @@ -1450,10 +1450,10 @@ void DenseMatrix::GradToCurl(DenseMatrix &curl)
  int j = i+n;
  // curl of (Ui,0)
  - curl(i,0) = y;
  + curl(i,0) = -y;
  // curl of (0,Ui)
  - curl(j,0) = -x;
  + curl(j,0) = x;
  }
  }
  else
  