Add pg_rewind, for re-synchronizing a master server after failback.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 61081e75c6741024f7717ade0450090590e96c85
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-03-23T17:47:52Z
Releases: 9.5.0
Add pg_rewind, for re-synchronizing a master server after failback.

Earlier versions of this tool were available (and still are) on github.

Thanks to Michael Paquier, Alvaro Herrera, Peter Eisentraut, Amit Kapila,
and Satoshi Nagayasu for review.

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