* Top-level default leafs assigned.

* Enforcing RFC 7950 Sec 7.6.1 means unassigned top-level leafs (or leafs under non-presence containers) are assigned default values.
* NACM default behaviour is read-only (empty configs are dead-lockedd)
  * This applies if NACM is loaded and `CLICON_NACM_MODE` is `internal`
* Fixed: [default values don't show up in datastores #111](https://github.com/clicon/clixon/issues/111)

lib/src/clixon_xml.c

@@ -1883,6 +1883,7 @@ xml_copy_one(cxobj *x0,
     default:
 	break;
     }
+    xml_flag_set(x1, xml_flag(x0, XML_FLAG_DEFAULT)); /* Maybe more flags */
     retval = 0;
  done:
     return retval;