[patch] Use /etc/mailname if available

[Aaron Bentley]

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John A Meinel wrote:
> Honestly, though. The email address is only for personal use. bzr uses
> it a little bit so that it can help ensure unique ids, but really the
> datestamp and random number provide the uniqueness.

I think it uses it because it's conventional to have a committer field
in commits, and so it guesses the best one it can.  I don't think it was
ever about unique ids.

We could just require the user to set an email address if bzr can't find
a reasonable one (e.g. by checking EMAIL), but that would turn our
3-step startup into a 4-step one.  But using the wrong committer ID is
perhaps serious enough that we should do it.

Aaron
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