Add the notion of REPLICA IDENTITY for a table.

Robert Haas <rhaas@postgresql.org>

Commit: 07cacba983ef79be4a84fcd0e0ca3b5fcb85dd65
Author: Robert Haas <rhaas@postgresql.org>
Date: 2013-11-08T17:30:43Z
Releases: 9.4.0
Add the notion of REPLICA IDENTITY for a table.

Pending patches for logical replication will use this to determine
which columns of a tuple ought to be considered as its candidate key.

Andres Freund, with minor, mostly cosmetic adjustments by me

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