Update OpenFisca
Update OpenFisca

Ref of update: sgmap/openfisca#14f0bb0e49be40cfbabb41302fdd3d383241d7f3

* update-openfisca:
  Unify naming
  Add employer exonerations
  Rename vieillesse_deplafonnee_employe to vieillesse_deplafonnee_salarie
  Rename vieillesse_plafonnee_employe to vieillesse_plafonnee_salarie
  Rename maladie_employe to mmid_salarie
  Rename maladie_employeur to mmid_employeur
  Add ircantec_salarie and ircantec_employeur
  Rename cotisations_patronales_main_d_oeuvre to cotisations_employeur_main_d_oeuvre
  Rename cotisation_exceptionnelle_temporaire_employe to cotisation_exceptionnelle_temporaire_salarie
  Add contribution_exceptionnelle_solidarite
  Rename assedic_employeur to chomage_employeur
  Rename assedic_employe to chomage_salarie
  Rename arrco_tranche_a_employeur to arrco_employeur
  Rename arrco_tranche_a_employe to arrco_salarie
  Rename apec_employe to apec_salarie
  Add agirc_employeur
  Rename agirc_tranche_b_employe to agirc_salarie
  Rename agff_tranche_a_employe to agff_salarie
  Rename agff_tranche_a_employeur to agff_employeur
  Replace fnal_tranche_a and fnal_tranche_a_plus_20 by fnal

sandcha/cout-embauche,sgmap/cout-embauche,sgmap/cout-embauche,sandcha/cout-embauche