Grégoire Henry b674c538b2 Shell: refactor the distributed DB.
This refactors `src/node/shell/state.ml` in order to trace the source of
blocks and operations. This prepares the node for the three-pass
validator.

In the procces, it adds an in-memory overlay for blocks and operations.
2017-02-25 18:14:05 +01:00
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