Fixes and cleanups to hgeditor: - "HG: merge resolve" isn't supported for a long time now. - detection of unchanged commit message if signing is turned off. - don't add manifest hash to commit message if not signing.

#!/bin/sh

set -x
mkdir t
cd t
hg init
echo a > a
hg add a
hg commit -t test -d "0 0"
hg history
hg manifest
hg cat a
hg verify