GeometricField::internalField() -> GeometricField::internalFieldRef()

Non-const access to the internal field now obtained from a specifically
named access function consistent with the new names for non-canst access
to the boundary field boundaryFieldRef() and dimensioned internal field
dimensionedInternalFieldRef().

See also commit a4e2afa4b3

src/dynamicFvMesh/dynamicRefineFvMesh/dynamicRefineFvMesh.C

@@ -344,7 +344,7 @@ Foam::dynamicRefineFvMesh::refine
 
                 surfaceScalarField& phi = *iter();
 
-                sigFpe::fillNan(phi.internalField());
+                sigFpe::fillNan(phi.internalFieldRef());
 
                 continue;
             }