A small patch for the webrev utility

[Anthony Petrov]

Hi Jean-Christophe,

Here's a patch for the webrev utility that makes the process of 
'guessing' the username better if one has several "username = *" lines 
in the .hgrc file: it now assumes the first name is the right one. W/o 
the patch all the names got concatenated which looked unpleasant.

Also it could retrieve the realname (gcos) using the id/getent pair even 
if the script uses the .hgrc name for the username. If you agree, I 
could make a patch as well.

--
best regards,
Anthony
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