Do not orient nor compute the area

Do not orient nor compute the area of `cont_list(n_cont)`. When the
area is too small, then we have one more copy than before, of
`cont_list(n_cont)` to `out_cont`, but, on the other hand, we have one
less call to `ccw_orient` than before. So this change should not
impact performance. Note that the orientation and area of
`cont_list(n_cont)` were not used after `get_1_outerm`.

Preparing to keep `cont_list` in projection coordinates.

Inst_eddies/get_1_outerm.f90

@@ -158,14 +158,14 @@ contains
           ! Assertion: n_cont <= n_max_cont - 1
        end if
 
-       cont_list(n_cont)%area = spher_polyline_area(cont_list(n_cont)%polyline)
-       call ccw_orient(cont_list(n_cont))
+       out_cont = cont_list(n_cont)
+       out_cont%area = spher_polyline_area(out_cont%polyline)
 
-       if (cont_list(n_cont)%area < min_area) then
+       if (abs(out_cont%area) < min_area) then
           out_cont = null_ssh_contour()
           n_cont = 0
        else
-          out_cont = cont_list(n_cont)
+          call ccw_orient(out_cont)
        end if
     end if test_n_points