Bug 18251: SCO alerts - need a trigger for successful checkouts

Bug 18251: SCO alerts - need a trigger for successful checkouts

This patch adds simple text and a div to allow for sounds to be
configured upon successful SCO checkout

To test:
1 - Enable sco module
2 - Enable AudioAlerts
3 - Define alert with
     Selector: .sco-alert-success
     Sound:http://localhost:8081/intranet-tmpl/prog/sound/opening.ogg
4 - Checkout to patron using SCO
5 - Note only feedback is a addition of item to checkouts list
6 - Apply patch
7 - Checkout ot patron via SCO
8 - You should hear the sound specified above
9 - You should also see a note: Item checked out

Followed test plan, works as expected.
(Works with external sound only, see Bug 16732)
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>