Some minor changes: I forgot to add the new pipeline meta-commands to psql's help output, this is now added in 0002. I've also reworded the doc a bit.
v04-0001-Reset-query-buffer-on-a-backslash-error.patch
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v04-0002-Add-pipeline-support-in-psql.patch
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v04-0003-Consider-pipeline-implicit-transaction-as-a-tran.patch
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