* Fix permanent and period size independent variables neutralization
4.2.0
* Introduce a YAML test runner in openfisca_core - Introduce command line tool `openfisca-run-test`
* Refactor the dummy tax benefit system included in openfisca-core - Make the dummy country look like a real one - Split defining the country from testing
4.1.7
* Improve docstring of `MarginalTaxRate.inverse` and add test
4.1.6
* Decrease verbosity of `combine_tax_scales`
4.1.5
* Enable `extra_params` in formulas with new syntax.
4.1.4beta
* Fixup 4.1.2: * When building positions, handle cases where persons belonging to an entity are not grouped by entity in the persons array.