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/user/models/group.php

@@ -34,7 +34,7 @@ class Group_Model extends ORM implements Group_Definition {
   }
 
   public function save() {
-    if (!$this->loaded) {
+    if (!$this->loaded()) {
         $created = 1;
     }
     parent::save();