isDatField()
isDatField(mixed  $datfield): integer
                Utility function to check if a field is datfield in driver It must detect unstranslated and already translated datfield as well
Parameters
| mixed | $datfield | Field name  | 
                            
Returns
integer —0 if not a datfield, 1 for v1 notation, 2 for v2 notation, 3 for DatfieldExpression