Implement deadlock avoidance
This is a first version with several optimizations possible: - improve EventQueue (or implement a specific queue) to minimize deadlocks - turn the RebaseObject packet into a notification Sorting oids could also be useful to reduce the probability of deadlocks, but that would never be enough to avoid them completely, even if there's a single storage. For example: 1. C1 does a first store (x or y) 2. C2 stores x and y; one is delayed 3. C1 stores the other -> deadlock When solving the deadlock, the data of the first store may only exist on the storage. 2 functional tests are removed because they're redundant, either with ZODB tests or with the new threaded tests.
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