Bug 20755: Add separate email configuration for acquisition and serial emails

Bug 20755: Add separate email configuration for acquisition and serial emails

This patch allows every library to define the From and Reply-to email addresses for acquisition and serial emails (orders and claims) sent by Koha.
Especially in large libraries with dedicated acquisition departments we need a way that vendors/booksellers can reply directly to the acquisition team and not to the library default email. The library email in the library configuration can then be used for circulation purposes only.

1) Apply patch, run database update
2) Make sure you have set up Koha to send up email (SMTP server, KohaAdminEmailAdress, etc.)
3) Make sure you have a vendor set up with a valid email address.
4) Check that you have four new system preferences:
  - AcquisitionsDefaultEMailAddress
  - SerialsDefaultEMailAddress
  - AcquisitionsDefaultReplyTo
  - SerialsDefaultReplyTo
5) Check that there is no change in behaviour if the four new system preferences are left empty:
All acquisition and serial emails are sent from the library email (or KohaAdminEmailAddress if no library email is set)
6) Create an order with at least one order line. Send the order to your vendor by email.
7) Create an acquisition claim notice and send it to your vendor.
8) Create a subscription linked to your vendor and with at least one late issue. Claim the issue.
9) There should be no change in behaviour: emails should be sent from library email (or KohaAdminEmailAddress if nothing is set on library level)
10) Configure different email addresses for system preferences:
  - First email address: AcquisitionsDefaultEMailAddress, SerialsDefaultEMailAddress
  - Second email address: AcquisitionsDefaultReplyTo, SerialsDefaultReplyTo
11) Repeat steps 6-8
12) Verify that the library specific acquisition and serial email addresses are used as From and Reply-to.

Sponsored-by: Karlsruhe Institute of Technology (KIT)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>