LP 1507807: Show Alert dialogs in XUL staff client.

LP 1507807: Show Alert dialogs in XUL staff client.

If the circ.in_house_use.copy_alert org setting is true and the copy
has an alert_message, then we display an alert dialog with the copy
alert message when doing an in-house-use in the XUL staff client.

If the circ.in_house_use.checkin_alert org setting is true and the
copy location checkin_alert field is also true, then we display an
alert dialog with the "item needs to be routed to..." alert message
when doing an in-house-use in the XUL staff client.

Signed-off-by: Jason Stephenson <jason@sigio.com>