[ZODB-Dev] IStorageIteration (update)

[Christian Theune]

Hi,

we've started working on this on a branch. We're getting pretty far with 
a reasonable amount of work and are going the approach that the ZEO 
server keeps the state of the iterator for the client.

This allows us to keep the current interface intact and fulfill our 
requirements.

We also found a solution to clean up unused iterators automatically by 
having the clientstorage maintain a weakref list of the iterators handed 
out and notify the server when the references are gone (this will happen 
at transaction boundaries).

Christian

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