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.
adding base
abort: cannot delete applied patch c
Now at: b
a
b
a
b
series
status
Now at: a
a
b
series
status
1 [mq]: a
0 base
abort: cannot delete revision 3 above applied patches
f
4 [mq]: f
3 [mq]: e
2 [mq]: d
1 [mq]: a
0 base