Working on minimal test of fiche de paie
Fiche de paie (WIP)
Fix some hanging holder
WIP
Working on adding fiche de paie entries
Cleaning wrong import
Fix arrco employeur for cadre
Cleaning and renanming (WIP)
Starting verification
Add Enum to base module and cleanup travail imports.
Merge remote-tracking branch 'openfisca/master'

Conflicts:
	openfisca_france/model/cotisations_sociales/travail.py
	openfisca_france/model/lgtm.py
	openfisca_france/model/model.py
Remove useless import.
Rework preloading of zone_apl to work with new syntax-based formulas.
Fixing decompositions / refactoring cotsal et cotpat
Remove unwanted print
Fix to pass test_cotsoc_fonc and test_fiche_de_paie
Again
Fixing bug for non individual cases
Remove test on date in formula, because it is already defined in column definition.
Sort functions.