Refactoring needed in ExoGAINS data input

[Renato-Rodrigues]

@rauner @jhilaire
This code link in exoGAINS uses the fe_tax_sub_sbi to calculate, as far as I understood, sector shares on final energies.

However, this tax specific set will be removed very soon from the code due to a change on the final energy tax code.
Also, if your intention is to have FE shares, using the vm_cesIO is not the correct way as it would probably not work properly in different module realizations that use useful energy or services instead of final energy at the CESIO level.

Would one of you be able to refactor this code to use instead other way to calculate the needed shares?

You could probably do it very straightforward by using the variable vm_demFeSector. This variable includes the final energy carriers and the sector information, and it is already used in other parts of the model to similar purposes, like for example, in the q_shfe equation that calculates final energy carrier shares in the sector total final energy.