Reconcile nodes/*funcs.c with recent work.

Noah Misch <noah@leadboat.com>

Commit: b8fe12a83622b350dc6849f8bb933bd8a86c1424
Author: Noah Misch <noah@leadboat.com>
Date: 2015-08-06T00:44:27Z
Releases: 9.6.0
Reconcile nodes/*funcs.c with recent work.

A few of the discrepancies had semantic significance, but I did not
track down the resulting user-visible bugs, if any.  Back-patch to 9.5,
where all but one discrepancy appeared.  The _equalCreateEventTrigStmt()
situation dates to 9.3 but does not affect semantics.

catversion bump due to readfuncs.c field order changes.

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