Internationalize scenarios

[fpagnoux]

Connected to openfisca/openfisca-web-api#76

A lot of the logic to build an openfisca scenario from a json is duplicated in all countries.

This is mainly used to serve the tax and benefits system with web-api, but it has other applications.

Inside this duplicated code, we can find... a lot of duplication, as the entities are usually hardcoded, and similar logic is repeated for Familles, FoyerFiscal...

This PR generalise a big chunk of the code, and moves it from france to core.

To be honest, yes, this is still ugly and full of debt. The scenarios need a huge refactoring, which would probably be done the best by throwing everything away.

However, we have no visibility about when this refactoring will come, and having a turnkey working api will be useful for tunisia.

[benjello]

Je ne suis pas sûr de tout maîtriser, mais avançons !

[cbenz]

Small issue with naming

[cbenz]

If I understand correctly, you chose to extract biryani converters to a dedicated module, which is a good choice! This lightens the code of the Core.

But I'm not 100% satisfied with the name json_to_test.py. test makes me think about a unit test, here it is a test case.

[fpagnoux]

👍

[fpagnoux]

You're right, this was confusing.

I indeed chose to separate some logic specific to turning a JSON object into a test case in a separated flag to clear the scenario code.

This is renamed, tell me if it's ok for you.

[cbenz]

I tested this PR on my machine and it's OK.

There is still some dept as @fpagnoux said, but it's way better!

[benjello]

@cbenz : did you try it on openfisca-senegal ? openfisca-tunisia ?

[fpagnoux]

I tried in with openfisca-senegal. Not with tunisia.

[fpagnoux]

It works with senegal.
I can help you migrate tunisia: the main task is to distinguish in scenarios which part of the JSON processing are specific to Tunisia and which part are commons.