Fints2ledger

The `password` field in the config can now be left empty. The password will then be prompted each time the application is run. Use this if you don't feel comfortable storing your banking password in a file.

- match:
payee: "Landlord"
purpose: "Monthly rent"
fill:
credit_account: "expenses:monthly:rent"


If prompting is needed, e.g. when you want to automatically fill the credit_account but still be prompted for the purpose, use empty values in the `fill` section:

- match:
payee: "Landlord"
fill:
credit_account: "expenses:monthly:rent"
purpose:

- match:
payee: "Landlord"
purpose: "Monthly rent"
fill:
credit_account: "expenses:monthly:rent"
purpose: "Monthly rent"