jio dashboard metadata field improved

You can now affect the value of "times" field in some metadata
field. Every '\u0000' found in this field will be replaced by the
"times" value from 0 to n.

examples/jio_dashboard.html

@@ -280,15 +280,23 @@ function callback(err, val, begin_date) {
   log('return : ' + JSON.stringify(val, null, "  "));
 }
 
-function command(method) {
+function command(method, num) {
   var begin_date = Date.now(), doc = {}, opts = {};
 
   if (!my_jio) {
     return error('no jio set');
   }
 
-  doc = JSON.parse(select('#metadata').value);
-  opts = JSON.parse(select("#options").value);
+  doc = select('#metadata').value;
+  opts = select("#options").value;
+
+  if (num !== undefined) {
+    doc = doc.replace(/\\u0000/g, num);
+    opts = opts.replace(/\\u0000/g, num);
+  }
+
+  doc = JSON.parse(doc);
+  opts = JSON.parse(opts);
 
   log(method + '\ndoc: ' + JSON.stringify(doc, null, "  ") +
       '\nopts: ' + JSON.stringify(opts, null, "  "));
@@ -319,7 +327,7 @@ function doCommandNTimes(method) {
     n = 1;
   }
   while (++i < n) {
-    command(method);
+    command(method, i);
   }
 }