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KeyError must be raised if the history is empty, see
HistoryTests.checkSimpleHistory test case.

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- Rename length 'parameter' to 'size'
- Define None as default version.

See HistoryTests.checkSimpleHistory.

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This method is the symetric of close() on Storage (see previous commit) and
is required for some ZODB tests. Support read_only attribute.

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Behaviour is not defined for NEO but shutting down the client side seems
really bad (close is aliased to __del__).
Move no-op methods (close & cleanup) at file end, with not implemented ones.

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See HistoryTests.checkSimpleHistory.

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Storage.store calls can be pipelined when implementation can take advantage of
it (as Zeo does). This allows reducing the impact of (network-induced, mainly)
latency by sending all objects to storages without waiting for storage answer.

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Those "properties" were put in _threads_dict (cf __setattr__), but only for
the thread who instantiates ThreadContext (until next "clear" call from/for
that thread, where they are not inserted in cleared version).

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This causes isolation problems in tests (and was detected because of this)
but would have also caused problem if multiple Storage (and hence App class)
instances were used in a single process.

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Reorganize unimplemented methods, gather all at end of file.

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If ZODBTests is imported at module level, TestLoader handle it and find
dupliucates test cases.

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It is important that unregistering a response from dispatcher and putting
it in its queue are atomic at dispatcher level to support askStoreObject
pipelining.

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This fixes problems uncovered by current work on askStoreObject pipelining.

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This ensure the cluster is stop and will not alter next rounds.
Use -1 to indicate a failure instead of 0.

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Also, avoid using local variables when they are used just once.

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Same for local_var.tid.

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