* HTTP Option: TRUSTED_PROXIES (default: <none>
To support running osTicket installation on a web servers that sit behind a
load balancer, HTTP cache, or other intermediary (reverse) proxy; it's
necessary to define trusted proxies to protect against forged http headers.

* HTTP Option: LOCAL_NETWORKS (default: 127.0.0.0/24)
When running osTicket as part of a cluster it might become necessary to
white list local/virtual networks that can bypass some authentication
checks.

* Validate CLIENT_IP to make sure it's a valid IP address.

This commit attempts to remove all coding standard warnings emitted by PHP
7.0.

This allows messages to be stashed in the session and displayed on a
following request. This will be pivotal in implementing the PRG
(post-redirect-get).

This patch adds support for automatic date and time formatting based on a
selection of locale. The locale can default to the system or user specified
language+locale, or can be elected separately. For instance, English
speakers can pick between US, GB, and many other English speaking locales.

This also removes the need of the %timezone table and uses the timezonedb
built into PHP 5.3+. User's can now select from a much longer list of
database and no longer need to deal with the DST checkbox.

Attachment settings are now exclusively handled by the settings on the
ThreadEntry field on the ticket details form. Enabling attachments as well
as tuning attachment validation settings are all handled from the one place
now.

Previously, if the quoted response mechanism was disabled, then outgoing
mail would also not include the message-id token. This breaks the
correlation of email to ticket-thread. Now, the message-id token is always
embedded in HTML emails even if the quoted-response removal system is
disabled.

(Turns out that the message-id token was always included in text bodies.)

Multilanguage Support via gettext

- added gettext encapsulations to all texts i thought necessary
- added fallback function for the case that the gettext extension isn't loaded
- added browser language detection
- added gettext to the list of optional extensions in setup
- rewritten some of the texts to use sprintf instead of appending strings
- added german translation file
- removed mark_overdue-confirm from cannedresponses.inc.php

extend multi language support and a fex fixes

- Better detection of translation files
- Added functionality to redirect language codes (see redirecting
language codes)
- Ticket Status can be translated
- The Datepicker can be translated
- Extended functionality of 'testlang.php' to show what language code is
used to translate

Forgotten to apply a patch from RC5 to RC6

- Forgotten to change $var to $vars in line 380 of class.mailfetch.php
- Removed unneeded comment

Added php_gettext as primary translation engine

- Added php_gettext support (thanks to Danilo Segan and Steven
Armstrong)
- php_gettext is now the primary translation engine
- Extended language detection functionality

Add error/misconfiguration checks and fix undefined variables

There are extensions such as "7z" and "gz" that are valid.

THISPAGE is unreliable for CLI cron calls. It was historically used so the
admin could figure out which file/page generated the error. But with
backtrace support we no longer need it.

Fixes #262

This includes the initial concept of pluggable authentication along with the
initial concept for a plugin management system.

And extend the information to email templates

Fix PHP NOTICE level errors for cron jobs executed from the command line

Fixes #4

This patch changes the behavior of the mailer to support a 'text' option to
hint if the message is a text-only message. If so, no HTML processing will
be performed on the message and a text-only email (with no inline
attachments) will be emitted and sent.

Also converts ROOT_DIR detection to always use forward slashes. And it fixes
the removal of the leading double-backslash on Windows UNC names (fixes #649)

The previous implementation did not work correctly for symlinked folders.
The new approach uses debug_backtrace() and ROOT_DIR to determine the
difference between ROOT_DIR and the osTicket installation path.

This thing is like a turd that won't flush

Also, allow for the administrator to manually define the ROOT_PATH in the
config file (the very last mile).

Anything that would happen after the last patch was applied would never be
logged, because the system would immediately indicate that no upgrade was
pending.