Allow for tree format to be pinned back to previous version #41
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Maybe required when using per-bucket AAE in a rolling upgrade.
This could be achieved using riak_core_capability, but as it is a one-off need with a relatively minor impact in a small subset of configurations, allow it be managed through manual configuration instead. This makes the removal easier as well (the history of riak_core_capability is that some temporary changes can have end up with a long-term presence in the code).