Support PL/Tcl functions that return composite types and/or sets.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 26abb50c490dee191df21282bc940b94118550aa
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-11-06T22:56:05Z
Releases: 10.0
Support PL/Tcl functions that return composite types and/or sets.

Jim Nasby, rather heavily editorialized by me

Patch: <f2134651-14b3-efeb-f274-c69f3c084031@BlueTreble.com>

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