* 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/clixon/clixon_data.h

@@ -54,7 +54,8 @@
 typedef struct {
     uint32_t  de_id;       /* session id */
     cxobj    *de_xml;      /* cache */
-    int       de_modified; 
+    int       de_modified; /* Dirty since loaded/copied/committed/etc XXX:nocache? */
+    int       de_empty;    /* Empty on read from file, xmldb_readfile and xmldb_put sets it */
 } db_elmnt;
 
 /*