Add a weight column to the items model. Change the album ordering to

use this as the default instead of id.  This prepares the way for
manual reordering in the organize functionality.

core/tests/Albums_Controller_Test.php

@@ -31,7 +31,7 @@ class Albums_Controller_Test extends Unit_Test_Case {
     $_POST["name"] = "new name";
     $_POST["title"] = "new title";
     $_POST["description"] = "new description";
-    $_POST["column"] = "id";
+    $_POST["column"] = "weight";
     $_POST["direction"] = "ASC";
     $_POST["csrf"] = access::csrf_token();
     $_POST["_method"] = "put";