Preliminary work to cut over to Kohana 2.4

- Kohana::log() -> Kohana_Log::add()
- Kohana::config_XXX -> Kohana_Config::instance()->XXX
- Implement View::set_global in MY_View
- Updated Cache_Database_Driver to latest APIs
- ORM::$loaded -> ORM::loaded()
- Updated item::viewable() to use K2.4 parenthesization

modules/gallery/libraries/SafeString.php

@@ -146,7 +146,7 @@ class SafeString_Core {
    * Escape special HTML chars ("<", ">", "&", etc.) to HTML entities.
    */
   private static function _escape_for_html($dirty_html) {
-    return html::specialchars($dirty_html);
+    return html::chars($dirty_html);
   }
 
   /**