Fix reconciling split translations from nYNAB import creates orphan transfers (#2502)

* Reconciling split translations from nYNAB import creates orphan transfers
- Fixed link between subtransaction transfers and transaction transfers
- Reworked payee transaction and subtransaction import

* Reconciling split translations from nYNAB import creates orphan transfers
- Added release note

* Reconciling split translations from nYNAB import creates orphan transfers
- Reworkd data.transactions and data.subtransactions loops

* Reconciling split translations from nYNAB import creates orphan transfers
- Added comments

---------

Co-authored-by: DJ Mountney <david@twkie.net>