uniformize piwik code among branches

doc/eigendoxy_footer.html.in

diff --git a/doc/eigendoxy_footer.html.in b/doc/eigendoxy_footer.html.in
index e62af8e..878244a 100644
--- a/doc/eigendoxy_footer.html.in
+++ b/doc/eigendoxy_footer.html.in
@@ -17,8 +17,7 @@
 </small></address>
 <!--END !GENERATE_TREEVIEW-->
 
-<!-- Piwik --> 
-<!--
+<!-- Piwik -->
 <script type="text/javascript">
 var pkBaseURL = (("https:" == document.location.protocol) ? "https://stats.sylphide-consulting.com/piwik/" : "http://stats.sylphide-consulting.com/piwik/");
 document.write(unescape("%3Cscript src='" + pkBaseURL + "piwik.js' type='text/javascript'%3E%3C/script%3E"));
@@ -29,7 +28,6 @@
 piwikTracker.enableLinkTracking();
 } catch( err ) {}
 </script><noscript><p><img src="http://stats.sylphide-consulting.com/piwik/piwik.php?idsite=20" style="border:0" alt="" /></p></noscript>
--->
 <!-- End Piwik Tracking Code -->
 
 </body>