Bug fixes, refined the admin login routines

1.) Added code to the install script that detects the current session
path, creating a new, uniquely named folder for the session files if one
does not currently exist.
2.) Fixed a bug with the Search/Edit AIML admin page that prevented any
AIML categories from being displayed due to the wrong session variables
being loaded.
3.) Fixed a bug with the RSS feed display where garbage was sometimes
displayed if the forum pages were down.
4.) Fixed another bug with the RSS feed display where the admin script
would time out if the forum pages were not responding.
5.) Cleaned up some of the code where needed, standardizing the
remaining PHP comment headers to make them all the same, as well as
consolidating duplicated code in several admin pages