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

mkdir a
cd a
hg init
echo 123 > a
hg add a
hg commit -m "a" -u a -d "0 0"

cd ..
mkdir b
cd b
hg init 
echo 321 > b
hg add b
hg commit -m "b" -u b -d "0 0"

hg pull ../a
hg heads