OAK-1827: ClassCastException in NodeDocument.split() when collisions detected

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OAK-1727: Cross foreign cluster revision comparison may be wrong

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OAK-1813: LastRevSingleNodeRecoveryTest fails with Mongo

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OAK-1854: Duplicate revisions

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OAK-1814: RevisionComparator my incorrectly report a revision as FUTURE

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