Introducing product-based technology assumption into MARIO

[nigolred]

When one wants to retain the computational structure of the SUT to be used as a model, e.g. for LCA analyses, MARIO now implicitly allows only the industry-based technology assumption.

However, it is becoming increasingly necessary to be able to adopt the product-based technology assumption while retaining the SUT framework.

This requires adding an attribute when initialising a SUT table in MARIO. By default this will be compiled technology_assumption = 'industry-based'. This will result in the calc_all algorithm behaving exactly the same as it currently does.

If instead technology_assumption ="product-based" it will be necessary to fill in the endogenous coefficient matrix (to date, z) so that the make side is consistent with the equations for this assumption.

Attached is a conceptual Excel file to make the reasoning explicit, with nomenclature consistent with what is already present and potentially implementable in MARIO for completeness.
https://enextgen22.sharepoint.com/:x:/s/eNextGen/EUmvIiplgdFLkrD8B6I1SSMBD5KPsN-W9QfY07ZuU0fOWQ?e=4xLl9t