- Move access to it's own table.
- Refactor what department membership means in relation to group access

Add print options supports - staff can now print a ticket thread without internal notes + select paper size on the fly

And remove unnecessary parts of bootstrap.css

Migrate the PHP session from disk to database live. To pull this off, the
session contents are written to database under the current session id. When
the `ostversion` column is dropped from the %config table, the system will
automatically switch to database-backed sessions in osTicket 1.7 mode.

This is sort-of hacked together by carefully calling a instance method of
the osTicketSession class statically, and modify the instance method to
support static invocation.

Map each of the inputs from $_POST['ids'] into a separate, sanitized
database input (via the db_input() function), then implode() the array with
commas and build the SQL statement.

Protect againts cross-site request forgery attacks by requiring a special
form-field or header to be sent with requests that modify ticket system
data.

This meant a slight change to the AJAX ticket locking mechanism. It was
defined to lock with a GET request; however, GET requests are defined as
safe methods and should not modify backend data (such as a lock
acquisition). Therefore, the the lock acquire AJAX method was changed to
require a POST method.

Also remove old, no-longer-used staff panel include files

Rather than defaulting to either showing answered tickets or closed tickets
if there are no open tickets.