stack: introduce and explicite command to display the stack
If is worth testing having the feature lives outside 'hg topic --list'. The
'stack' name is sub optimal because the conflict with 'status'. using "hg st"
would still work as 'st' is hard coded, but this mean 'hg stack' has no short
version.
#!/bin/sh
# This file holds logic that is used in many tests.
# It can be called in a test like this:
# $ . "$TESTDIR/testlib"
# Enable obsolete markers and enable extensions
cat >> $HGRCPATH << EOF
[experimental]
evolution=createmarkers,exchange
[extensions]
rebase=
EOF
echo "topic=$(echo $(dirname $TESTDIR))/hgext3rd/topic" >> $HGRCPATH