Fixed issue on nb of retries + direct link to file

The exponential backoff was actually perform 4 times with delays of approximately 1, 2, 4 and 8s.
The last retry (after 16s) was skipped.
It also means that asking for 1 retry only with retryNumber actually meant performing 0 retry.

I also added a direct link to the right line of the right file in the Apps Script project with "directLink".

src/ErrorHandler.gs.js

@@ -55,7 +55,7 @@ function expBackoff(func, options) {
   var customError;
 
   // execute func() then retry <retry> times at most if errors
-  for (var n = 0; n < retry; n++) {
+  for (var n = 0; n <= retry; n++) {
     // actual exponential backoff
     n && Utilities.sleep(retryDelay || (Math.pow(2, n-1) * 1000) + (Math.round(Math.random() * 1000)));
 
@@ -278,9 +278,12 @@ function logError(error, additionalParams, options) {
 
   // Manage error Stack
   if (error.lineNumber && error.fileName && error.stack) {
+    var directLink = "https://script.google.com/macros/d/";
+    directLink+= ScriptApp.getScriptId() + "/edit?f=" + error.fileName + "&s=" + error.lineNumber;
     log.context.reportLocation = {
       lineNumber: error.lineNumber,
-      filePath: error.fileName
+      filePath: error.fileName,
+      directLink: directLink
     };
 
     var addonName = additionalParams && additionalParams.addonName || undefined;