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.
% no working directory
adding a
adding b
% hg parents
changeset: 2:6cfac479f009
tag: tip
user: test
date: Thu Jan 01 00:00:02 1970 +0000
summary: b
% hg parents a
changeset: 0:b6a1406d8886
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: ab
% hg parents -r 2
changeset: 1:d786049f033a
user: test
date: Thu Jan 01 00:00:01 1970 +0000
summary: a
% hg parents -r 2 a
changeset: 0:b6a1406d8886
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: ab