semi-automatically request machine-readable fiscal data via FragDenStaat

[jfilter]

https://offenerhaushalt.de/ is the German frontend for https://openspending.org/.

Sub Tasks:

1. find cities/regions that do not have an entry
2. formulate a freedom of information requests via the FragDenStaat API

https://fragdenstaat.de/api/v1/: With the API, you can also send requests. But it's rather undocumented right now. This will most likely change in near future

contact person: @jfilter