Pack is not implemented on manager, so it must raise.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2298 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/storage/database/manager.py

@@ -416,4 +416,5 @@ class DatabaseManager(object):
             Takes no parameter, returns a 3-tuple: compression, checksum,
             value
         """
+        raise NotImplementedError