blockchain: Make ver 5 to 6 db upgrades work again. #2446
Merged
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This allows version 5 to 6 database upgrades to work again by implementing code that is independent of the main code and works with the data structures as they existed in the version 5 database.
While here, it also updates some other cases in both older and newer upgrade code to make the upgrades stable even if the primary code changes.
A high-level overview of the key changes is: