Allow invalid (i.e. straight file names) links to be interpreted as eNotes.

src/core/annotation.js

@@ -792,6 +792,10 @@ var LinkAnnotation = (function LinkAnnotationClosure() {
     if (url) {
       if (isValidUrl(url, /* allowRelative = */ false)) {
         data.url = tryConvertUrlEncoding(url);
+      } else {
+        warn("not a valid url! " + url);
+        url = url.replace(/(.*)\.pdf/, '$1');
+        data.url = '/enotes/' + url;
       }
     }
     if (dest) {