Open Stack

> Sounds good to me. The list base objects don't have methods to make changes to the list - so it would be a case of iterating looking at each object in the list. That would be ok. 

Hmm? You mean for NovaObjects that are lists? I hesitate to expose lists
as changed when one of the objects inside has changed because I think
that sends the wrong message. However, I think it makes sense to have a
different method on lists for "are any of your contents changed?"

I'll cook up a patch to implement what I'm talking about so you can take
a look.

--Dan