Add pg_visibility contrib module.

Robert Haas <rhaas@postgresql.org>

Commit: ba0a198fb133eb3426bffdc2e369cce1bafe1612
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-03-08T13:42:01Z
Releases: 9.6.0
Add pg_visibility contrib module.

This lets you examine the visibility map as well as page-level
visibility information.  I initially wrote it as a debugging aid,
but was encouraged to polish it for commit.

Patch by me, reviewed by Masahiko Sawada.

Discussion: 56D77803.6080503@BlueTreble.com

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