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

applications/utilities/postProcessing/dataConversion/foamToTetDualMesh/foamToTetDualMesh.C

@@ -91,7 +91,7 @@ void ReadAndMapFields
             )
         );
 
-        Field<Type>& fld = tetFields[i].internalField();
+        Field<Type>& fld = tetFields[i].internalFieldRef();
 
         // Map from read field. Set unmapped entries to nullValue.
         fld.setSize(map.size(), nullValue);