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PT's make() will override it right after.

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Better performances are expected because of the removal of all MOD() operators
that would do a full scan to find the rows maching a given partition. Now a
query like '... where partition = x limit 10' should match only a subtree of
the table and not scan lots of rows if there is none matching this partition.

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Also, re-document getObject.

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For further description, see storage/handlers/replication.py .

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This makes sure all invalidations about loaded object up to its actual load
have been received by client, and forwarded to ZODB.
This fixes a potential problem of a transaction being able to see objects
committed by another transaction after it started itself.

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The problem with previous implementation was that each storage locally
decided what undo actually did to data. This causes problems when a
storage doesn't have a complete view of past transaction but accepts write
queries, ie when it replicates.
This implementation reduces the decision to a readable subset of storage
nodes (which are hence not replicating), and then sends that decision to
all storage nodes, hence fixing the issue.
Also, DatabaseManager.storeTransaction now consistently expects object's
value_serial to be packed, not an integer.

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Otherwise, None ends up being put in object cache, which fails.

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This fixes random failures in old ZODB undo tests, where tpc_vote was not
called before tpc_finish/tpc_abort.

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This makes it possible to implement an undo on client side, as a flaw has
been found in it when used in parallel with replication.

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This was intended to be a raise, but was broken. Anyway, it's not
required for not-committed-yet pack implementation.

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tm.storeObject is not supposed to return a callable.

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