Merge branch 'ab/fix-columns-to-80-during-tests'

Output from some of our tests were affected by the width of the
terminal that they were run in, which has been corrected by
exporting a fixed value in the COLUMNS environment.

* ab/fix-columns-to-80-during-tests:
  test-lib.sh: set COLUMNS=80 for --verbose repeatability

t/test-lib.sh

@@ -406,14 +406,15 @@ LANG=C
 LC_ALL=C
 PAGER=cat
 TZ=UTC
-export LANG LC_ALL PAGER TZ
+COLUMNS=80
+export LANG LC_ALL PAGER TZ COLUMNS
 EDITOR=:
 
 # A call to "unset" with no arguments causes at least Solaris 10
 # /usr/xpg4/bin/sh and /bin/ksh to bail out.  So keep the unsets
 # deriving from the command substitution clustered with the other
 # ones.
-unset VISUAL EMAIL LANGUAGE COLUMNS $("$PERL_PATH" -e '
+unset VISUAL EMAIL LANGUAGE $("$PERL_PATH" -e '
 	my @env = keys %ENV;
 	my $ok = join("|", qw(
 		TRACE