Fix behaviour of commit. It's now a fatal error if the option to --logfile isn't readable. Ditto if both --message and --logfile are specified.

#!/bin/sh

hg init a
cd a
echo a > foo
hg add foo
hg commit -m 1 -d "0 0"
rm foo
hg remove foo
hg commit -m 2 -d "0 0"

cd ..
hg clone a b