Openfisca-core

New features

- Add `entities.find_role()` to find roles by key and `max`.

Technical changes

- Document `projectors.get_projector_from_shortcut()`.

> As `TracingParameterNodeAtInstant` is a wrapper for `ParameterNodeAtInstant`
> which allows iteration and the use of `contains`, it was not possible
> to use those on a `TracingParameterNodeAtInstant`

New features

- Allows iterations on `TracingParameterNodeAtInstant`
- Allows keyword `contains` on `TracingParameterNodeAtInstant`

Technical changes

- Fix `openfisca-core` Web API error triggered by `Gunicorn` < 22.0.
- Bump `Gunicorn` major revision to fix error on Web API.
Source: https://github.com/benoitc/gunicorn/issues/2564

Technical changes

- Add tests to `entities`.

Technical changes

- Skip type-checking tasks
- Before their definition was commented out but still run with `make test`
- Now they're skipped but not commented, which is needed to fix the
underlying issues

Technical changes

- Make `Role` explicitly hashable.
- Details:
- By introducing `__eq__`, naturally `Role` became unhashable, because
equality was calculated based on a property of `Role`
(`role.key == another_role.key`), and no longer structurally
(`"1" == "1"`).
- This changeset removes `__eq__`, as `Role` is being used downstream as a
hashable object, and adds a test to ensure `Role`'s hashability.