Add modifier for field patterns
If a coat of arms is only described as a field pattern (e.g. barruly), it cannot be described more precisely with modifiers. This means that coats of arms that are "barruly of 6 diapered", for example, cannot be described. (Ex: http://digitalheraldry.org/dho/representation#c17697bb-6882-4dec-9b3a-052a415e39ba)