Comparator fixed

Plein de différences au cours des comparaisons : on s'y attèle cette
après-midi!
Working on numerical inversion (WIP)
Still WIP on inversion
Finishing numerical inversions

Still problem for cho and rst because of csg_rempl
Add formula to compute "zone aide personnelle au logement" from postal code.
Remove Prestion (replaced by Column).
Improve suggestions.
Modfiying eligibility condition for ASI and ASPA
Change min. vieillesse for ASPA
Finish removing Prestation
Create real columns for birth and prenom.
Add test for APL.
Set default "activite" for children.
Rename AgesCol to AgeCol. Add formulas for age and agem (from birth).
Correct indent.
Add SciPY dependency.
Try to use Debian packages of NumPy, SciPY, Pandas & PyTables with Travis.
Forget using Ubuntu versions of Pandas and SciPY: They are too old.
Add enumeration to type_sal column.
Typo.