When the webserver is behind a reverse proxy, $ENV{REMOTE_ADDR} is not
the actual remote client's address but the reverse proxy's address. The
actual remote client's address is available from an environment
variable. The name of this variable depends on the proxy, e.g. pound
uses $ENV{HTTP_X_FORWARDED_FOR}.
As suggested by tyatsumi on the wiki, all access $ENV{REMOTE_ADDR} now
happens via a new function which allows users to override it in their
config file.
Replaced the $Id$ tags in $WikiDescription for all the modules and wiki.pl itself with a link to the source and an appropriate wiki page, if possible. This is shown in action=version and should help users figure out what another wiki has installed.
