Everywhere that REMOTE_ADDR was used, a session object is available, so
instead use its remote_addr method.
In IkiWiki::Receive, stop setting a dummy REMOTE_ADDR.
Note that it's possible for a session cookie to be obtained using one IP
address, and then used from another IP. In this case, the first IP will now
be used. I think that should be ok.
I've seen user(http://*) confuse someone who didn't know pagespecs to think
that just http://* would moderate all comments to every page, or something
like that.
* moderatedcomments: Added moderate_pagespec that can be used
to control which users or comment locations are moderated.
This can be used, just for example, to moderate http://myopenid.com/*
if you're getting a lot of spammers from one particular openid
provider (who should perhaps answer your emails about them),
while not moderating other users.
* moderatedcomments: The moderate_users setting is deprecated. Instead,
set moderate_pagespec to "!admin()" or "user(*)" instead.