degesch: finish /set

One bug remaining to make it work.

common.c

@@ -1385,6 +1385,20 @@ end:
 	return object;
 }
 
+/// Clone an item.  Schema assignments aren't retained.
+struct config_item_ *
+config_item_clone (struct config_item_ *self)
+{
+	// Oh well, it saves code
+	struct str tmp;
+	str_init (&tmp);
+	config_item_write (self, false, &tmp);
+	struct config_item_ *result =
+		config_item_parse (tmp.str, tmp.len, true, NULL);
+	str_free (&tmp);
+	return result;
+}
+
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
 // XXX: this thing is ugly in concept