General suggestion

[lucas-vivier]

• Create a configuration file (to avoid to have to manually fill the main.R file)
  I would suggest a .json file that is easier to read from a coding perspective, than .csv file.

• Create a list variable report, with several keys.
  report = list(var = c("energy"), type="STURM", geo="R12")

• Include category data and also prices data in input_general file. Path are for now hard written in the code.

• Create only one instance (the most granular one) for each object in the scenario function. Building stock bld_det_age_iis sufficient (no need to have stock_aggr). Add a groupby at the beginning of function calling stock_aggr to replace it.