Code cleanup.
Rework Scenario JSON.

Now the JSON of an API request looks like:
dict(
    scenarios = [
        dict(
            familles = [
                dict(
                    parents = ['ind0', 'ind1'],
                    enfants = ['ind2'],
                    ),
                ],
            foyers_fiscaux = [
                dict(
                    declarants = ['ind0', 'ind1'],
                    personnes_a_charge = ['ind2'],
                    ),
                ],
            individus = [
                dict(
                    birth = '1965-12-27',
                    id = 'ind0',
                    sali = 12000,
                    ),
                dict(
                    birth = '1965-12-28',
                    id = 'ind1',
                    ),
                dict(
                    birth = '2005-12-29',
                    id = 'ind2',
                    ),
                ],
            menages = [
                dict(
                    personne_de_reference = 'ind0',
                    conjoint = 'ind1',
                    enfants = ['ind2'],
                    ),
                ],
            year = 2006,
            ),
        ],
    )
Signal an error when an individual doesn't belong to a famille, a foyer_fiscal or a menage.
Update parameters + minor changes
Revert "Update parameters + minor changes"

This reverts commit 302f263eef66118e1f39d22bc9c5befa3d3abd60.
Revert "Revert "Update parameters + minor changes""

This reverts commit 99dc983b84eea2cccaae86aa552b435e05c9b891.
Update parameters + minor changes
Merge branch 'master' of https://github.com/MalkIPP/openfisca-france
Merge pull request #8 from MalkIPP/master

Update parameters + minor changes
Remove unused Scenario._isPopulated.
Merge branch 'master' of github.com:LouisePaulDelvaux/openfisca-france into LouisePaulDelvaux-master

Conflicts:
	openfisca_france/model/irpp_reductions_impots.py
Code cleanup
Encode unicode to utf-8 before printing it.
Use new API JSON format.
Working on public servant
Fix bugs right brut and imposable salaries

With a useful test_brut_to_imposable
Fix minor bug
Fixing nmen=1 bug

Ongoing work on public servant
Typo.
Don't use maxrev when nmen is 1.