Reduces the amount of duplicated (or deductible) information in packet
generators and parsers.

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Computation of next TID is now part of master's transaction manager.

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- Allow a fine-grained test suite.
- Avoid shadow internal method definitions.
- Remove some meaningless checks

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This does not add pack support, but merely prepares a place on transaction
description to tell whether it has been packed, along with corresponding
transport (packed definition, handlers, etc).

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Undo fails if any of the following is true:
- cell_list is empty (should never happen, add an assertion for this)
- all connections get a ConnectionClosed exception
- transaction cannot be found in any storage
- an unexpected answer was received (it did not change txn_info)

This fixes the first case, as the test might have received old values from
former executions (which could be neither -1 nor 0) in the same
transaction.

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This can happen if client's knowledge of nodes is lagging, and it should
be safe to ignore this here.

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This fixes a memory leak in dispatcher.queue_dict.

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Singeltons can not be used in NEO because client side process may deals with
multiple NEO cluster. Add a callback on connection when linked with a node to
update node's connection property at connection closure.

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Version support is not implemented, always return an empty version string.

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Update comment: it is actually used in ZODB unit tests.

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The documentation of this API is innacurate, as all parameters are expected
to have default values in ZODB unit tests.

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Remove the binding at connection closure.

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