Remove unwanted prints
Fix LAndais Piketty Saez reform and test
Rename slice(s) to bracket(s)
Rewrite "brut" formulas using new syntax and a period-agnostic declaration. Correct error message.
Merge remote-tracking branch 'openfisca/master'

Conflicts:
	openfisca_france/model/model.py
Comment import of inversion_revenus and move other one.