add_area_code           Get area codes from area names
add_area_name           Get area names from area codes
add_item_cbs_code       Get commodity balance sheet item codes from
                        item names
add_item_cbs_name       Get commodity balance sheet item names from
                        item codes
add_item_prod_code      Get production item codes from item names
add_item_prod_name      Get production item names from item codes
build_supply_use        Supply and use tables
calculate_lmdi          Calculate LMDI decomposition.
calculate_nue_crops     N soil inputs and Nitrogen Use Efficiency (NUE)
                        for crop
calculate_nue_livestock
                        NUE for Livestock
calculate_system_nue    System NUE
create_n_nat_destiny    GRAFS Nitrogen (N) flows at Spain national
                        level
create_n_production     N production for Spain
create_n_prov_destiny   GRAFS Nitrogen (N) flows
create_n_soil_inputs    Nitrogen (N) soil inputs for Spain
expand_trade_sources    Trade data sources
fill_linear             Fill gaps by linear interpolation, or carrying
                        forward or backward.
fill_proxy_growth       Fill gaps using growth rates from proxy
                        variables
fill_sum                Fill gaps summing the previous value of a
                        variable to the value of another variable.
get_bilateral_trade     Bilateral trade data
get_faostat_data        Scrapes activity_data from FAOSTAT and slightly
                        post-processes it
get_feed_intake         Livestock feed intake
get_primary_production
                        Primary items production
get_primary_residues    Crop residue items
get_processing_coefs    Processed products share factors
get_wide_cbs            Commodity balance sheet data
harmonize_interpolate   Harmonize advanced cases with interpolation for
                        1:N groups
harmonize_simple        Harmonize rows labeled "simple" by summing
                        values
items_cbs               Commodity balance sheet items
items_prod              Primary production items
polities                Polities
whep_inputs             External inputs
whep_list_file_versions
                        Input file versions
whep_read_file          Download, cache and read files
