Bug 35044: Update: Manual invoices, manual credits and accountlines

Bug 35044: Update: Manual invoices, manual credits and accountlines

Test plan, k-t-d:

Preparation: Create additional fields for table 'accountlines:credit',
visit:
/cgi-bin/koha/admin/additional-fields.pl?tablename=accountlines%3Acredit

2 text fields, one repeatable, one not-repeatable
2 AV fields, one repeatable, one not-repeatable

1) Add a new manual credit for admin borrower:
/cgi-bin/koha/members/mancredit.pl?borrowernumber=51
2) Set the mandatory "Amount" input (e.g. '5'). Click the 'Next' and
   press 'Ok' on the alert box.
3) Fill in all additional fields, click the '+New' and 'Clear' links,
   hit 'Save'
4) On the table, click "Details" for the for account line we just
   created.
5) Notice the additional fields are there, repeated fields are comma
   separated.
6) Repeat the above test plan, but for accountlines:debit instead,
   visit:
/cgi-bin/koha/admin/additional-fields.pl?tablename=accountlines%3Adebit
7) To add a manual invoice, visit:
   /cgi-bin/koha/members/maninvoice.pl?borrowernumber=51

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>