mq command-line

hi,

I really wonder why mq is not a separate program from hg. This would
have a number of advantages:
  - normal hg users do not see any mq commands in hg --help and do not
need to be even aware of mq
  - mq users get to have a tool maybe better designed/focused to their
needs, that is, dealing with patch queues.

Of course, I have not really looked at the hg/mq sourcecode and I am
only a small user of both so, I might be completely off track but this
really seems like a very sensible thing to do to me.

regards,
Mathieu
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