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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.

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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.

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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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This allows parallel execution of tpc_begin, stores & related conflict
resolution and tpc_vote for different transactions.
This requires an extension to ZODB allowing to keep TID secret until
tpc_finish (ie, so that it doesn't require tpc_vote to return tid for each
stored object).

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If TID allocation and conflict resolution are serialised at database scope
(=cluster scope in NEO), the question doesn't arises: when we have a TID,
we are the latest TID until we call tpc_finish.
If they are not serialised, it means TID allocation will happen after
conflict resolution, as TID generation must be serialised anyway, and in
such case, the temporary TID we have when detecting conflicts has no
ordering signification, so it is meaningless to check their chronology.

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Remove round-trip to master upon "load" call.
Move load/loadBefore/loadSerial/loadEx from app.py to Storage.py.
This is required to get rid of master node round-trip upon each "load"
call.
Get rid of no-op-ish "sync" implementation.
Separate "undoing transaction ID" from "undoing transaction database
snapshot" when undoing.

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This ensures invalidations are sent in strict ascending TID values order.

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