r2242 removed the case where we wouldn't be abdle to access the last
version of an object with loadBefore, and its test code is reused here to
check the "not visible" case.
r2250 modified the response in case where an internal error occured.

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Also, fix _load error message, as only data inconsistency can lead to -1
error code now (and it is set locally).

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There is nothing to clean on the master side when a client abort a
transaction.

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Master transactions objects are instanciated during the finish phase only,
which means that any transaction known by the master is being committed.

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FileStorage.copyTransactionsFrom doesn't have a verbose parameter in its
latest version.

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Avoid switching to an unexpected interpreter after forking.

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This has been deprecated at least in Zope 2.8.8, maybe earlier.

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Also, reverts r2197, as it is unclear what bug it was trying to fix, and it
doens't seem required (there is no call to Replicator.act() outside of
doOperation).

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This causes garbage collection problems, as BaseConnection instances also
hold a reference to HandlerSwitcher instance. It is unclear why it fails,
as microbenchs show this should not be a problem for gc.
Also, move loggers out of HandlerSwitcher.setHandler to avoid passing a
connection parameter just for them.

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It is more efficient to provide a boundary value than a row count range.
This fixes replication on partitions with a large number of objects, revisions
or transactions: query time is now constant where it used to increase, causing
timeout problems when query duration exceeded ping time + ping timeout (11s
currently).

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Previous name was too close to the regular-user SQL connection getter.
Also, prevent subclasses from calling it.

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This made it impossible to detect when a storage didn't contain an object.

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It is not possible to move them out of container loop, as tid is a loop
variable.

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Also, stop using a dict in an inefficient way, and replace it by a set.

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