mq: regularize patch header creation.
Do not prefix qnew patches with [mq]: when a message has been given.
Always use [mq]: as the prefix for generated commit messages.
#!/bin/sh
hg init dir
cd dir
echo bleh > bar
hg add bar
hg ci -m 'add bar'
hg cp bar foo
echo >> bar
hg ci -m 'cp bar foo; change bar'
hg debugrename foo
hg debugindex .hg/store/data/bar.i