[2.1.0] Standalone file now can be generated using maintenance/merge-library.php. Also:

- HTMLPURIFIER_PREFIX constant added, and relevant files transitioned over
- Custom ChildDef added to default include list
- Tester accepts ?standalone parameter

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1316 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier.php

@@ -40,6 +40,9 @@
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+// constants are slow, but we'll make one exception
+define('HTMLPURIFIER_PREFIX', dirname(__FILE__));
+
 // almost every class has an undocumented dependency to these, so make sure
 // they get included
 require_once 'HTMLPurifier/ConfigSchema.php'; // important