Helper to make a new DDI structure (not very useful for end-users).
make_ddi_from_scratch(file_name = NULL, file_path = NULL,
file_type = NULL, ipums_project = NULL, extract_date = NULL,
extract_notes = NULL, rectypes = NULL, rectype_idvar = NULL,
rectypes_keyvars = NULL, var_info = NULL, conditions = NULL,
citation = NULL, file_encoding = NULL)