[3.1.0] multitest.php now works again for all version, however, some hacks to PHPT are required

- Bootstrap hotfix to prevent multiple loading in standalone. We need a better way of doing this!
- Make extras/ autoloader polite too
- Initialize autoloaders in common.php
- Add trailing dash to "skip" in phpt
- Upgrade SimpleTest.php not to allow directories

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1554 48356398-32a2-884e-a903-53898d9a118a

tests/common.php

@@ -57,6 +57,12 @@ if ( is_string($GLOBALS['HTMLPurifierTest']['PEAR']) ) {
 // after external libraries are loaded, turn on compile time errors
 error_reporting(E_ALL | E_STRICT);
 
+// initialize HTML Purifier
+require_once '../library/HTMLPurifier.auto.php';
+
+// initialize alternative classes
+require_once '../extras/HTMLPurifierExtras.auto.php';
+
 // load SimpleTest addon functions
 require_once 'generate_mock_once.func.php';
 require_once 'path2class.func.php';