[3.1.0] More PHP4->PHP5 conversions, notably reference removal of most methods that return objects

- Removed HTMLPurifier_Error
- Documentation updates
- Removed more copy() methods in favor of clone
- HTMLPurifier::getInstance() to HTMLPurifier::instance()
- Fix InterchangeBuilder to use HTMLPURIFIER_PREFIX

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1689 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/Generator.php

@@ -12,19 +12,16 @@ class HTMLPurifier_Generator
     
     /**
      * Bool cache of %HTML.XHTML
-     * @private
      */
     private $_xhtml = true;
     
     /**
      * Bool cache of %Output.CommentScriptContents
-     * @private
      */
     private $_scriptFix = false;
     
     /**
      * Cache of HTMLDefinition
-     * @private
      */
     private $_def;