Expand the regression tests for PL/Tcl.

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

Commit: 961bed0208912a929a47c5a30190ff76748f3a03
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-01-09T15:10:22Z
Releases: 10.0
Expand the regression tests for PL/Tcl.

This raises the test coverage (by line count) in pltcl.c from about 70%
to 86%.

Karl Lehenbauer and Jim Nasby

Discussion: https://postgr.es/m/92a1670d-21b6-8f03-9c13-e4fb2207ab7b@BlueTreble.com

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