This change is prerequisity for future changes. API of
`TransactionRepository` is changed a bit. Now it's possible to filter
transaction by kind (all/sent/received) event when
`TransactionNG.Overview` structure is returned.
Tests are now fixed for new methods and new objects. For this mocked
database `darkside_data.db` had to be updated to the latest scheme used
by the Rust code.
Michal Fousek
Francisco Gindre