- Add a hook method to retrieve communication type and communication
- Improve normal communication if there is a credit note
If there is a credit note that partially cancel an invoice, the payment communication
should be the combination of the invoice reference and the credit note one.
- Remove not needed assert as parameter is required
- Use the 'payment_reference' field if filled in
- Add existing payment references to communication
If some movements have been reconciled with the original invoice,
their references should be added in communication too.
e.g.: Manual credit notes
- Don't duplicate communication reference
