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/comment/models/comment.php

@@ -59,7 +59,7 @@ class Comment_Model extends ORM {
   public function save() {
     if (!empty($this->changed)) {
       $this->updated = time();
-      if (!$this->loaded && empty($this->created)) {
+      if (!$this->loaded() && empty($this->created)) {
         $this->created = $this->updated;
         $created = true;
       }