dict keys are changed because of the customisable new behavior of
labelstower blueprint.

select all attributs from element talble in order retrieve all attributs that
developper declared in app/models.py.

I refactor the first sql statement to let the developper define is element structure.
The only mandatory attribut for element table will be id. The rest is up to the developper.

We don't know how the label and element tables will b.
That's is the reason why we reused element and label structure
define by the developper of labelstower framework.

Reproduction de la structure de CodeGuards, à LT_CFG prêt, et il reste du travail sur les tests unitaires de getter.py