* Fix `cerfa_field` validation in `Column`, `Formula` and `AbstractConversionVariable`. Previously, some variables having `cerfa_field` as a `dict` were converted to `unicode` by mistake. See https://github.com/openfisca/openfisca-france/issues/543
3.0.2
* Move `calmar.py` to [OpenFisca-Survey-Manager](https://github.com/openfisca/openfisca-survey-manager).
No incidence on users since it was only needed for dataframes.
3.0.1
* Adapt requested_period_last_value and last_duration_last_value to extra params
3.0.0
* Update introspection data. This allows to enhance data served by the web API which itself feeds the Legislation Explorer.