Feature/filters revisited

Reviewed-by: Jared Hancock <jared@osticket.com>

Force target selection on filter form
Add minor code improvements

Installer error reporting setting.

Reviewed-by: Jared Hancock <jared@osticket.com>

Add auto-focus to username field

Reviewed-by: Jared Hancock <jared@osticket.com>

Admin Panel Revisited.

Reviewed-by: Jared Hancock <jared@osticket.com>

Encode text to UTF8 on PDF exporter

Reviewed-by: Jared Hancock <jared@osticket.com>

Protect Include directory

Reviewed-by: Jared Hancock <jared@osticket.com>

Add GROUP BY clause to canned response load

Reviewed-by: Jared Hancock <jared@osticket.com>

Change the with of the info table

* Change table name from ost_email_filter* to ost_filter*
* Add patch for target field.

* Collapse date settings into system settings.
* Move auto-cron setting to emails settings page.
* Move clickable urls setting to tickets settings page.

 * Collapse Department into Staff tab.
 * Add a new 'Manage' tab - home for managing items, lists..etc.
 * Collapse Help Topics into Manage tab.
 * Move SLA and API from Settings to Manage tab.

Add Content-Type

Reviewed-By: Peter Rotich <peter@osticket.com>

Implement automatic client logins

Reviewed-By: Peter Rotich <peter@osticket.com>

Feature/nested help topics

Reviewed-by: Jared Hancock <jared@osticket.com>

Rename 'Knowledgebase' to FAQs and Categories to FAQ Categories

Reviewed-By: Peter Rotich <peter@osticket.com>