Fix relative path for Xhprof reporting link

tests/xhprof/footer.php

@@ -10,8 +10,8 @@ if (extension_loaded('xhprof')) {
     $xhprof_data = xhprof_disable();
     $xhprof_runs = new XHProfRuns_Default();
     $run_id = $xhprof_runs->save_run($xhprof_data, $profiler_namespace);
- 
     // url to the XHProf UI libraries (change the host name and path)
-    $profiler_url = sprintf('http://my.chamilo.net/tests/xhprof/xhprof_html/index.php?run=%s&source=%s', $run_id, $profiler_namespace);
+    $subDir = substr(__DIR__, strlen(trim($_SERVER['DOCUMENT_ROOT'])));
+    $profiler_url = sprintf($subDir.'/xhprof_html/index.php?run=%s&source=%s', $run_id, $profiler_namespace);
     echo '<a href="'. $profiler_url .'" target="_blank">Profiler output</a>';
 }