This fixes cases where storage tries to answer a request after executing
queued events. This cannto happen with current code, but will happen in
near future.

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This is not used currently, and prevents method argument extension.

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This prevents doing pop(0)/insert(0, ...) needlessly on the first item.

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- Pop queued transaction from the beginning instead of end
- Restore test for begin with a tid
- Add test to check transactions unlocking mechanism
- Add/fix comments

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- add missing status parameter
- tabs are evil
- use sys.exit instead of raising KeyboarInterrupt (it raises SystemExit)

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The "data" parameter was meant to be used as an opaque type, but as
"forget" method needs to know its structure, stop pretending it's opaque.
This simplifies dispatch arguments a little bit.

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Also, factorise refcount code.

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Hotshot profiling shows FIFO.head() is called very often (~300k times for
embedded test suite). This change showed a ~30% speed increase for tested
case.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2553 71dcc9de-d417-0410-9af5-da40c76e7ee4

It updates self._size, so we must read it from there each time.
This also uses the history queue, which was ignored by this code, hence
this should make better use of MQ algorithm.

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2552 71dcc9de-d417-0410-9af5-da40c76e7ee4

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undoLog doesn't work when first is non-zero, this breaks iterator and
cannot be fixed for undoLog at the moment.

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This query happens when a storage node joins the cluster, to delete all
rows belonging to partitions it is not assigned to (ex: storage was down
and partition table was reorganised before it rejoined cluster).

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