Users who currently use the back button to return to the previous page
after logging in or logging out need to select it more than once and are
often return to a cached version of the page they were previously
viewing instead of one that reflects an updated cookie state. The only
other option currently available to the user is to re-navigate to the
page which they wish to view (likely the previous page).
This change improves the usability of the logout functions by providing
a link to return to the previous pages after logging in or logging out.
Previous pages are returned without cache.
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.
