[basic schemas] patient name now includes display_name

schemas/pat-Name.yaml

@@ -1,6 +1,11 @@
 description: All relevant info about the patient's name.
 type: object
 properties:
+  display_name:
+    description: |-
+      The full name as commonly displayed in dutch custom: initials, partner name, followed by own name.
+    type: string
+    example: M.A. van der Dussen-de Villepin
   firstname:
     description: |-
       Patient's first name(s), separated by spaces.