Separate variable and reform from main code

[benjello]

Some variable directly linked to reforms and or specific to some data and however part of the main code base.
They should be part of their reform or be handled when building the dataset to be used for the simulation.

This issue should list those variable and try to fix the situation.

Variables related to data:

• depenses_diesel_corrigees and depenses_diesel_corrigees_entdshould be removed and taken care of in get_input_data_frame.
• idem for depenses_essence_corrigees
• idem for depenses_carburants_corrigees