                        Changes in version 0.1.0                        

Initial release.

  - rais_available() lists every archive published on the PDET/MTE FTP
    server, with size, modification date and edition (final, partial,
    legacy).
  - rais_files() resolves offline which archive holds a state in a year
    (one file per state up to 2017, regional files from 2018) and
    rais_ufs() gives the state table behind it.
  - rais_download() fetches the archives into an idempotent local cache
    that mirrors the server layout (rais_cache_dir(), rais_cache_list(),
    rais_cache_clear()).
  - rais_read() stream-reads a .7z archive, filtering by state and
    selecting columns chunk by chunk, detecting the file generation (;
    with decimal comma up to the RAIS 2022, , with decimal point from
    the RAIS 2023) and mapping both to the same normalized column names;
    rais_fetch() combines download and read for several years.
  - rais_stock() consolidates the stock on 31 December, admissions,
    separations and December payroll by any grouping.
  - rais_layout() documents the columns of the employment and
    establishment files, with the two header spellings of each.
  - Sample archives in inst/extdata (both generations, employment and
    establishments, plus a pre-2018 state file) allow every reading
    function to be tried offline.
