slight code hygiene for rssaction

slight code hygiene for rssaction

I moved the $creators array from being a global variable to being an
instance variable.

I also changed the URL that was used for the user, based on whether
they're a remote or local user.

Finally, I changed instances of $config to calls to common_config().

darcs-hash:20080716152009-84dde-8d077ab92d1252c252ab722ba887a57b177c8f65.gz