Add option to create a replication slot in pg_basebackup if not yet present

When Who What
2017-09-27 14:11:09 Peter Eisentraut (petere) Closed in commitfest 2017-09 with status: Committed
2017-09-24 03:06:58 Peter Eisentraut (petere) Added petere as committer
2017-09-24 03:06:56 Peter Eisentraut (petere) New status: Ready for Committer
2017-09-11 09:46:33 Michael Banck (mbanck) New status: Needs review
2017-09-06 16:22:38 Peter Eisentraut (petere) New status: Waiting on Author
2017-08-16 16:17:51 Peter Eisentraut (petere) Added petere as reviewer
2017-04-09 11:18:56 Michael Banck (mbanck) Changed authors to Michael Banck (mbanck)
2017-04-09 11:18:40 Michael Banck (mbanck) Attached mail thread 1489918907.4172.18.camel@credativ.de
2017-04-09 11:18:39 Michael Banck (mbanck) Created patch record