This fixes a regression introduced by implementation of IMVCCStorage in r2532.
On recent ZODB, this fixes a severe performance issue.
With ZODB 3.4, objects were never invalidated, which was even worse.

This fixes includes compatibility code for ZODB 3.4 so that each connection
has its own NEOStorage instance.
The DB's storage is changed to always consider the last revision of
objects.

IMVCCStorage seems too complicated to me. Connection should be a better
place to implement it (by extending/fixing the 'before' attribute).
So we have decided that NEOStorage stops implementing IMVCCStorage.

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Just don't use iterkeys on dictionaries, it's the default iterator anyway.

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Connection closure is either wanted by the replication node (-> no log)
or not serious (-> warning).

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1000 transactions is so small that reports showed significant higher values than
with 10000 transactions.

Repeat 2 times instead of 3, so that tests don't take too much time.

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All Partition objects must be updated because all of them may contain an object
of the given transaction, even if the transaction itself is stored in another
storage.

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What testRestartWithMissingStorageFastStartup tested was never broken.
It is wanted that the missing storage is not known in this use case.

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Similar to r2777 but for transactions instead of objects.

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This allows to setup an almost fully functional cluster without additional
processes. Threads are scheduled so that they never run simultaneously,
eliminating most random.
There's still much improvement possible like controlled randomization,
or easier debugging when switching from one thread to another.

As mock objects are not usable in such tests, an API should be implemented to
trace/count any method call we'd like to check.

This fixes test_notifyNodeInformation_checkUnregisterStorage

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- make 'undo' compatible with ZODB 3.9.x
- fix load of original version of object

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