[trakshayaofficial]

Purpose of this PR

This PR adds the mapping files required for the Sustainability-MIP (SusMIP).

• SusMIP A: Provides the mapping of .mif files from the REMIND-MAgPIE 3.2-4.6 model version for the SHAPE outputs.
• SusMIP B: Provides the mapping required for the current SusMIP protocol.

Checklist:

• I did not use Excel to open csv files or checked that no side-effects occur (changed values, many new quotation marks, …)
• I added any renamed piam_variable to renamed_piam_variables.csv to guarantee backwards compatibility.
• For REMIND variables, I used |+| notation consistently. This can be achieved automatically with updatePlusUnit().

It is recommended to have a look at the tutorial before submission.