Allow empty variable - or whatever objects return

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

Example use case %staff.name  %team.name ... etc.

Change %assigned to mean assignees (staff or/and team)

* 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.