LP#1356477: update selfcheck interface

LP#1356477: update selfcheck interface

This patch replaces the Logout and Logout with Receipt buttons in
the selfcheck interface with a single Logout button and a set of radio
buttons (whose labels are clickable) that allow the user to specify
whether they want an email receipt, a print receipt, or no receipt upon
logging out.

If the user has no email address, the option to select email receipts
will not be presented to them.

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>