Big ship deltas - 2.0

[heifner]

Change Description

eosnetworkfoundation/mandel#24

Fix for deltas bigger than uint32_t size can indicate. This was hit on Wax.

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• Other - special case

Testing Changes

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Consensus Changes

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API Changes

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[huangminghuang]

This changes the disk format of the ship log and we should also change the ship_current_version value. However, ship_current_version=1 is already taken, I am not exactly sure which version we should use here.

[tbfleming]

On Mandel, I'm leaning against bumping the version. As long as the size isn't exceeded, it's backwards compatible. If it is exceeded, boost will try to decompress an empty stream. If boost throws, it will disconnect the client. If boost returns an empty stream, the client will receive an empty stream and fail to deserialize, indicating a problem.