Inverted order of conditionals in GetUrlLink, and renamed function.

Fixes #50.

Fixed test case as well.

bibtexbrowser.php

@@ -1199,13 +1199,13 @@ class BibEntry {
   }
 
   /** returns a "[pdf]" link if relevant. modified to exploit the new method, while keeping backward compatibility */
-  function getUrlLink($iconurl = NULL, $label = 'pdf') {
-    if ($this->hasField('url')) {
-      return $this->getLink('url', $iconurl, $label);
-    }
+  function getPdfLink($iconurl = NULL, $label = 'pdf') {
     if ($this->hasField('pdf')) {
       return $this->getLink('pdf', $iconurl, $label);
     }
+    if ($this->hasField('url')) {
+      return $this->getLink('url', $iconurl, $label);
+    }
     // Adding link to PDF file exported by Zotero
     // ref: https://github.com/monperrus/bibtexbrowser/pull/14
     if ($this->hasField('file')) {
@@ -1816,7 +1816,7 @@ function bib2links_default(&$bibentry) {
   }
 
   if (BIBTEXBROWSER_PDF_LINKS) {
-    $link = $bibentry->getUrlLink();
+    $link = $bibentry->getPdfLink();
     if ($link != '') { $links[] = $link; };
   }