git-svn-id: https://svn.erp5.org/repos/neo/trunk@2102 71dcc9de-d417-0410-9af5-da40c76e7ee4

This mimics what FileStorage uses (file offsets) but in a relational manner.
This offloads decision of the ability to undo a transaction to storages,
avoiding 3 data loads for each object in the transaction at client side.
This also makes Neo refuse to undo transactions where object data would happen
to be equal between current value and undone value.
Finally, this is required to make database pack work properly (namely, it
prevents loosing objects which are orphans at pack TID, but are reachable
after it thanks to a transactional undo).

Also, extend storage's transaction manager so database adapter can fetch data
already sent by client in the same transaction, so it can undo multiple
transactions at once. Requires making object lock re-entrant (done in this
commit).

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1978 71dcc9de-d417-0410-9af5-da40c76e7ee4

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1851 71dcc9de-d417-0410-9af5-da40c76e7ee4

It is valid to return 'None' value as the transaction information is not
present on all storage node concerned by the transaction.
Update related test.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1721 71dcc9de-d417-0410-9af5-da40c76e7ee4

git-svn-id: https://svn.erp5.org/repos/neo/trunk@1648 71dcc9de-d417-0410-9af5-da40c76e7ee4