Convert bug numbers to links in descriptions for hgweb; set bugtracker in [web]

[Hideya 'OhaC' OHASHI]

2007/9/3, Edward Lee <edilee at mozilla.com>:
> This patch converts bug-like numbers in descriptions to be links if
> the configuration [web] section has a "bugtracker" value. Updates
> default and gitweb templates.

I already created interhg extension. Please check it.
interhg has some issues though.

http://www.selenic.com/mercurial/bts/issue698
http://www.selenic.com/mercurial/bts/issue699