GeometricField::dimensionedInteralFieldRef() -> GeometricField::ref()

In order to simplify expressions involving dimensioned internal field it
is preferable to use a simpler access convention.  Given that
GeometricField is derived from DimensionedField it is simply a matter of
de-referencing this underlying type unlike the boundary field which is
peripheral information.  For consistency with the new convention in
"tmp"  "dimensionedInteralFieldRef()" has been renamed "ref()".

applications/utilities/postProcessing/miscellaneous/writeCellCentres/writeCellCentres.C

@@ -115,7 +115,7 @@ int main(int argc, char *argv[])
             calculatedFvPatchField<scalar>::typeName
         );
 
-        V.dimensionedInternalFieldRef() = mesh.V();
+        V.ref() = mesh.V();
 
         volScalarField::Boundary& Vbf = V.boundaryFieldRef();