COMP: compilation with WM_SP

- STLpoint.H
- isoAdvection.C
- checkMesh/writeFields.C

STYLE: drop construct STLpoint(Istream&), since it doesn't make much sense

- No use case for reading via an OpenFOAM stream and tokenizer.
  Should always be parsing ASCII or reading binary directly.

applications/utilities/mesh/manipulation/checkMesh/writeFields.C

@@ -97,7 +97,7 @@ void Foam::writeFields
         (
             radToDeg
             (
-                Foam::acos(min(1.0, faceOrthogonality))
+                Foam::acos(min(scalar(1.0), faceOrthogonality))
             )
         );