- JsonFileCreator classes
- vs-time seems to work OK
- vs-temperature does not work (partial mismatch with original time
  series)
    - todo:
        - work from local data (new json file classes)
    - long-term solution (that is also how stefan does it)
        - first aggregate at local level (using appropriate
          time-dependent population weighting, or land-area weighting), then proceed to temperature binning
        - requires yearly temperature time series (stefan has to run the
          code again)
    - long-term 2:
        - work directly from original input data, so that stefan does
          not need to generate the intermediary netCDF file