hgweb: use ui:username rather than web:contact
This also removes the creation of .hg/hgrc with web:contact at init time.
Metadata-Version: 1.0
Name: mercurial
Version: 0.6
Summary: scalable distributed SCM
Home-page: http://selenic.com/mercurial
Author: Matt Mackall
Author-email: mpm@selenic.com
License: GNU GPL
Description: UNKNOWN
Platform: UNKNOWN