* C-API: Added xpath_first_localonly() as an xpath function that skips prefix and namespace checks.

* Added experimental code for optizing XPath search using binary search.
  * Enable with XPATH_LIST_OPTIMIZE
* Changed `clicon_rpc_generate_error(msg, xerr)` to `clicon_rpc_generate_error(xerr, msg, arg)`

include/clixon_custom.h

@@ -58,3 +58,9 @@
  * on the top-level for the modules involved in the netconf operation.
  */
 #define IDENTITYREF_KLUDGE
+
+/*! Optimize special list key searches in XPATH finds
+ * Identify xpaths that search for exactly a list key, eg: "y[k=3]" and then call
+ * binary search. This only works if "y" has proper yang binding and is sorted by system
+ */
+#undef XPATH_LIST_OPTIMIZE