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The old name wasn't very descriptive as of actual contents of the directory, which are historical snapshots in the snapshots/ subdirectory and mappingdata for rewritten tuples in mappings/. There's been a fair amount of discussion what would be a good name. I'm settling for pg_logical because it's likely that further data around logical decoding and replication will need saving in the future. Also add the missing entry for the directory into storage.sgml's list of PGDATA contents. Bumps catversion as the data directories won't be compatible. Backpatch to 9.4, which I missed to do as Michael Paquier luckily noticed. As there already has been a catversion bump after 9.4beta1, there's no reasons for having 9.4 diverge from master.