survey_1_to_3

first attemp to separate tables by level
survey_1_to_3, ok
ajustement

heures sup ameliorees + travais sur les gains de levee d'option
individuel
noi fiels rev;oved from index
better message for missing variables

That's not a revolution, I must admit
correction in _glo
first attempt for more table and less data
sandox
Merge pull request #131 from AlexisEidelman/datatable

Datatable : create thre table