Tweak a few more things in preparation for upcoming pgindent run.

Robert Haas <rhaas@postgresql.org>

Commit: 8826d850781cb328482c8f92af2a3d93385cd63b
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-05-03T14:52:25Z
Releases: 9.6.0
Tweak a few more things in preparation for upcoming pgindent run.

These adjustments adjust code and comments in minor ways to prevent
pgindent from mangling them.  Among other things, I tried to avoid
situations where pgindent would emit "a +b" instead of "a + b", and I
tried to avoid having it break up inline comments across multiple
lines.

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