storage: Add data recovery system #336
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This PR adds a very well and widely tested implementation of a data recovery system that is built into the Skytable storage engine (SDSS). It should be able to fix most common corruption issues, both due to an unexpected system failure (such as a power loss) or due to on-disk corruption.
The recovery system is very conservative in nature and hence will only make repairs that preserve consistency of the database.
Closes #333. Closes #327