tests/test-revert-flags

merge: introduce tool.check parameter

tool.check is a list of check options, and can be used in place of
tool.checkchanged and tool.checkconflicts:

Equivalences:
tool.checkchanged = yes
tool.checkconflicts = no
tool.check = changed

tool.checkchanged = no
tool.checkconflicts = yes
tool.check = conflicts

tool.checkchanged = yes
tool.checkconflicts = yes
tool.check = changed, conflicts

Add _toollist() wrapper for ui.configlist() to implement this consistently.

checkchanged and checkconflicts are still supported, but check is
preferred for implementing new check options.

#!/bin/sh

"$TESTDIR/hghave" execbit || exit 80

hg init repo
cd repo
echo foo > foo
chmod 644 foo
hg ci -qAm '644'

chmod 755 foo
hg ci -qAm '755'

echo '% reverting to rev 0'
hg revert -a -r 0
hg st
hg diff --git