Openfisca-core

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.

Technical changes

- Add `__hash__` method to `Role`.

Technical changes

- Document `Role`.

Breaking changes

- `Variable.get_introspection_data` no longer has parameters nor calling functions

The Web API was very prone to crashing, timeouting at startup because of the time consuming python file parsing to generate documentation displayed for instance in the Legislation Explorer.

New Features

- Allows for dispatching and dividing inputs over a broader range.
- For example, divide a monthly variable by week.