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/helpers/graphics.php

@@ -171,7 +171,7 @@ class graphics_Core {
     } catch (Exception $e) {
       // Something went wrong rebuilding the image.  Leave it dirty and move on.
       // @todo we should handle this better.
-      Kohana::log("error", "Caught exception rebuilding image: {$item->title}\n" .
+      Kohana_Log::add("error", "Caught exception rebuilding image: {$item->title}\n" .
                   $e->getMessage() . "\n" . $e->getTraceAsString());
       throw $e;
     }