Add a %ticket_history table to track ticket states over time, correlated to
the user account changing the ticket. Then, tickets are tracked to the table
when (re)opened, closed, overdue, transferred and assigned.

UTF-8 for install

Feature/scp login design 

Support register_globals PHP ini setting from the installer

Looks good. Remember, don't close the feature branch before the pull-request in the future, so we don't have the extra commits in the pull-request.

Approved - minor edits later.

Change href definitions for embedded links in the ticket thread so that the
click will be bounced through a script. This will hide the original referrer
URL where the link originated.

Reviewed: .htaccess for mod_rewrite

The API is implemented for HTTP requests via the api/http.php module.  Where
supported (by Apache), support rewriting URIs from something like
http://domain.tld/api/tickets.xml to
http://domain.tld/api/http.php/tickets.xml, so the explicit usage of the
http.php script is not required.

Review - Add deleteOrphans() utility to the File class to remove unused files

* Thanks for the fix.

Review - Reject tickets from banned emails. 

*Looks good 

Also add a cron job to perform the task on demand
Change the implementation for Ticket::deleteAttachments to call this method
after simply removing all entries from the %ticket_attachment table

This will include other information described in email filters that mark the
email as rejected. For instance, sender-name, message body content, etc. It
also allows for other matching methods (contains, !=, !contains), rather
than the quick banlist method from EmailFilter::isBanned().

Also fix bug in Filter::__construct that prevented any filter from ever
matching