This prepares NEO's initial eggification.
Credit: Leonardo Rochael Almeida


git-svn-id: https://svn.erp5.org/repos/neo/trunk@2263 71dcc9de-d417-0410-9af5-da40c76e7ee4

Record is expected to contain the TID of previous transaction which
modified given object. This is not the meaning of 3rd value returned by
_load (the TID of the next transaction modifying object).
So, instead, cache the last TID of each object, until there is no next
transaction modifying them.*
As this can become a memory problem with big number of objects, add a TODO.

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Also, make HandlerSwitcher.isPending() return a boolean, to avoid leaking
instance content to foreign code.

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There are 2 possibilities when an object is not found:
- the object doesn't exist at all
- the object exists, but nothing matches serial criterion

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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.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2254 71dcc9de-d417-0410-9af5-da40c76e7ee4

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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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