Abort when no username is found

[Martin Geisler]

Hi everybody,

I've just pushed c63c336ee2f7 which makes Mercurial abort when you make
a commit without having configured a username. The message you get is:

  Please specify a username.

How can we improve this message? We need to include information about
how one can specify the username. We talked on IRC about making a new
help topic, I imagine it could be called 'hgrc'. That would let us write

  please specify a username, see "hg help hgrc"

But what should we put in such a help topic? A short blurp with a
reference to "man hgrc" and a link to hgrc.5.html?

-- 
Martin Geisler

VIFF (Virtual Ideal Functionality Framework) brings easy and efficient
SMPC (Secure Multiparty Computation) to Python. See: http://viff.dk/.
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