Use KConfigXT for getting/setting the DN attribute order

GnuPG-bug-id: 5791

src/kcfg/settings.kcfg

@@ -98,6 +98,13 @@
      <default>true</default>
    </entry>
  </group>
+ <group name="DN">
+   <entry name="AttributeOrder" type="StringList">
+     <label>DN-Attribute Order</label>
+     <tooltip>Specifies the display order of the DN attributes of X.509 certificates.</tooltip>
+     <default></default>
+   </entry>
+ </group>
  <group name="Groups">
    <entry name="GroupsEnabled" type="Bool">
      <label>Enable Groups</label>