[3.1.0] Fix broken autoloader, resulting in duplicate classes

- Factor out phpt directory parsing
- More phpt tests

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1561 48356398-32a2-884e-a903-53898d9a118a

tests/HTMLPurifier/PHPT/loading/auto-without-spl-autoload.phpt

@@ -0,0 +1,19 @@
+--TEST--
+HTMLPurifier.auto.php without spl_autoload_register without userland autoload loading test
+--SKIPIF--
+<?php
+if (function_exists('spl_autoload_register')) {
+    echo "skip - spl_autoload_register() available";
+}
+--FILE--
+<?php
+assert("!function_exists('__autoload')");
+require_once '../library/HTMLPurifier.auto.php';
+$config = HTMLPurifier_Config::createDefault();
+$purifier = new HTMLPurifier($config);
+echo $purifier->purify('<b>Salsa!') . PHP_EOL;
+assert("function_exists('__autoload')");
+
+--EXPECT--
+<b>Salsa!</b>
+