Load DLW survey data and prepare it for the PIP pipeline
inv_dlw_load.RdLoads a survey from the datalibweb (DLW) storage using
pipload::load_dlw_data(), converts it to a data.table, attaches
survey-ID components as attributes, and adds the PIP class.
See also
Other pd_process_data pipeline:
add_attr(),
aux_hash_candidates(),
build_pip_inventory(),
create_attr(),
data_to_dt(),
filter_aux_data(),
filter_aux_inv(),
fix_year_var(),
get_aux_hashes(),
inv_to_process(),
log_report(),
pd_aux_attr(),
pd_deflation(),
save_pip_data(),
survey_id_to_attr(),
valid_dlw_load()