The `Client` was never closing the `Session` in `DatabaseSession`, which
meant that tests that compared transactions and banks would work since
attributes loaded only on select would still work.
However, this was not the intended behavior. Calling select from the
client with using sessions should detach objects completely from a DB
session. Therefore, attributes on Transaction, TransactionCategory and
Bank are now loaded on a join (lazy parameter).
Luís Murta
48fae5483d
