Bug 34377: Add managing librarain

Bug 34377: Add managing librarain

1. From the patron Accounting tab > "Create manual credit".
2. From the patron Accounting tab > "Create manua
3. Go to the Transaction tab (members/boraccount.pl) and click the 'Details' button.
4. Do this for  both a debit and a credit.
5. No info. about which librarain administered the credit/debit.
6. Apply patch
7. Try 3 -6 again, notice the table now shows which librarian administed the credit/debit.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>