Bug 26643: Notify librarian of completed transfers

Bug 26643: Notify librarian of completed transfers

It came to light that it's not clear to all users that a checkin results
in the completion of a transfer if one exists for the item being checked
in.  This patch adds such a notification to the error messages loop to
highlight that the item has been recieved from it's sending brnach.

To test
1/ Setup a transfer from branch A to branch B
2/ Check the item in at branch B
3/ Note that a new message appears in the 'Check in message' alert box
saying "Item recieved from branch A"
4/ Signoff

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>