Bug 9530 making changes to opac/opac-sendshelf.pl

Bug 9530 making changes to opac/opac-sendshelf.pl

To Test

1/ Edit the new systempreferences (ReplytoDefault and ReturnpathDefault)
2/ Optionally edit the branch the mail will be sent from, adding email addresses
3/ Send a list from the public (OPAC) interface
4/ Check that the mails have the correct From, Replyto and ReturnPath set
   The rules are
   If the values are set in the branch use that, else use the syspref

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>