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This change was accidentally committed, and turns out to be incorrect
(3.4.4 tests fail).

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old = 3.4.4 (Zope 2.8.x)
new = 3.10.0b5 (ZODB svn trunk)

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This fixes a potential bug triggered by a storage disconnecting while this
loop would be running, expecting answers from that storage: this would
prevent this loop from ever exiting.

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Maybe we could implement our own daemon system someday, but it's not high
priority enough to even be in the TODO list.

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This fixes problems in multi-database setups (ie. ZODB and other
databases).
For example, imagine a transaction stores an object in ZODB and its
identifier in a relational database.
Then, another process connected to the same databases and polling the
relational database find the new entry, and tried to load the object from
ZODB.
If the second node didn't process invalidation sent by initial transaction
when it starts its transaction, second client would not be able to see that
object, which should not happen (inter-database inconsistency).

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Otherwise the getUUIDList() used to notify non-lost storage nodes that
the transaction is fully locked will also return the uuid of the lost node.

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- Python version
- ZODB version (if available)
- Use machine() instead of processor() and architecture()

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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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