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.
browsing the offline pages. Add offline path_info to separate the
offline app from the ordinary stuff.
(DoManifest): Add the offline path_info, remove the missing pages
from @UserGotoBarPages because these result in 404 errors.
(DoOffline): Fix text.
