[1.7.0] Finish implementing legacy elements, begin implementing legacy attributes

- Migrated most unit tests over to XHTML 1.0 Strict to preserve transformation behavior
- Created %Core.ColorKeywords to be shared between CSS_Color and HTML_Color
- Added AttrDef_HTML_Color as AttrType Color
- HTMLPurifier_Config::create(HTMLPurifier_Config $config) now clones the object
- Attribute minimization for HTML implemented in Generator
- Move div@align fix from proprietary to regular set
- Color keywords now map to full six digit hexadecimal codes
- Harness will now tack on per-use-case configuration

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1084 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php

@@ -88,6 +88,7 @@ class HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4 extends
         $r['h5@align'] =
         $r['h6@align'] =
         $r['p@align']  =
+        $r['div@align'] = 
             new HTMLPurifier_AttrTransform_EnumToCSS('align', $align_lookup);
         
         // @bgcolor for table, tr, td, th ---------------------------------
@@ -179,7 +180,7 @@ class HTMLPurifier_HTMLModule_Tidy_Transitional extends
       HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4
 {
     var $name = 'Tidy_Transitional';
-    var $defaultLevel = 'light'; // switch this to heavy once we implement legacy fully
+    var $defaultLevel = 'heavy';
 }
 
 class HTMLPurifier_HTMLModule_Tidy_Strict extends