[development] Core drupal.module moved tocontribsite_network.module

[Walt Daniels]

>Let the foo at example.com be the username.  I.E. allow the use of @ in 
the username without treating it special.  This might require a 
password reset but the user can request that himself.  Feasible?

Contrib already has a number of modules that control what various sites want
to see as the userid. In general the whole web has mixed opinions on whether
one should use their email address, a screen name, a real name or allow
people to use any of the above. Going to OpenID introduces another
possibility, for example I am yktdan.pip.verisignlabs.com as well as
yktdan at drupal.org (and lots of other places).