[patch] Use /etc/mailname if available

[Aaron Bentley]

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Robert Collins wrote:
| I'm mostly in favour of this, but I'm not sure where Aarons sitting - I
| haven't see a +- from him, but with his concerns I'd like to hear that
| on this patch before offering +1 myself.

I don't see any harm in supporting /etc/mailname in the current regime,
so don't let me stop you.

My concern is that I'm not sure whether autoselecting the email address
is The Right Thing at all.  It may be better to prompt the user to
supply a committer ID than to silently store a junk committer ID.

Aaron
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