* JSON errors are now labelled with JSON and not XML

* Fixed: [Performance issue when parsing large JSON param](https://github.com/clicon/clixon/issues/266)
* Moved strlen() from for end condition
* Fixed debugging of xpath parser

lib/clixon/clixon_err.h

@@ -69,8 +69,8 @@ enum clicon_err{
     OE_UNIX,     /* unix/linux syscall error */
     OE_SYSLOG,   /* syslog error */
     OE_ROUTING,  /* routing daemon error (eg quagga) */
-    OE_XML,      /* xml parsing etc */
-
+    OE_XML,      /* xml parsing */
+    OE_JSON,     /* json parsing */
     OE_RESTCONF, /* RESTCONF errors */
     OE_PLUGIN,   /* plugin loading, etc */
     OE_YANG ,    /* Yang error */

lib/clixon/clixon_plugin.h

@@ -206,6 +206,9 @@ typedef int (plgreset_t)(clicon_handle h, const char *db);
  */
 typedef int (plgstatedata_t)(clicon_handle h, cvec *nsc, char *xpath, cxobj *xtop);
 
+/* Transaction-data type
+ * @see clixon_backend_transaction.h for full transaction API 
+ */
 typedef void *transaction_data;
 
 /* Transaction callback */