[2.1.0] Optimize ConfigSchema to only perform safety checks when HTMLPURIFIER_SCHEMA_STRICT is true

- Remove useless ->revision check in Config.php
- Add simple trace file to benchmarks folder

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1319 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Config.php

@@ -106,7 +106,6 @@ class HTMLPurifier_Config
         $ret = HTMLPurifier_Config::createDefault();
         if (is_string($config)) $ret->loadIni($config);
         elseif (is_array($config)) $ret->loadArray($config);
-        if (isset($revision)) $ret->revision = $revision;
         return $ret;
     }