[2.0.1] Implement error collection for RemoveForeignElements.

- Register Generator context variable.
- Implement special substitutions for error collector.
- Also sort by order the errors came in.
- Fix line number determination bug in Lexer::create().
- Remove vestigial variables.
- Force all tag transforms to use copy(), implement serialize, unserialize algorithm for copy() in tokens.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1238 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier.php

@@ -140,6 +140,10 @@ class HTMLPurifier
         
         $context = new HTMLPurifier_Context();
         
+        // our friendly neighborhood generator, all primed with configuration too!
+        $this->generator->generateFromTokens(array(), $config, $context);
+        $context->register('Generator', $this->generator);
+        
         // set up global context variables
         if ($config->get('Core', 'CollectErrors')) {
             // may get moved out if other facilities use it