PHOIBLE dataset snapshot — separate third-party terms

PHOIBLE, Steven Moran, Daniel McCloy and upstream contributors.
https://phoible.org/
https://github.com/phoible/dev

The exact revision and per-component SHA256 receipts are in manifest.json.
This is a pinned development snapshot, not a PHOIBLE release.
All original main-CSV columns, inventory records, mapping tables and the
reference bibliography are retained. The resources are not filtered by
IPAkit's house IPA parser.

File scopes:
  data/phoible.csv.gz, mappings/InventoryID-*.csv.gz and
  mappings/phoible-references.bib.gz:
    PHOIBLE data and mappings are licensed under the Creative Commons
    Attribution 4.0 International License (CC BY 4.0). The upstream
    LICENSE-DATA text is retained verbatim in CC-BY-4.0.txt.
    The main CSV retains each inventory's language name, ISO 639-3 code,
    Glottocode and donor source in its Source column.
    See https://creativecommons.org/licenses/by/4.0/ and
    https://phoible.org/about.
No donor raw-data/ files and no upstream code are included.

IPAkit packaging change: gzip transport only, empty filename and zero
timestamp. Decompressed source bytes are unchanged. These are editable
CSV/BibTeX sources, not compiled replacements. To recover any source file:
  python3 -m gzip -d a-copy-of-the-file.csv.gz
or use ipakit.phoible_source.read_source with an original upstream path.

No endorsement is implied. Preserve this notice, the attribution and the
license text when redistributing. IPAkit's BSD license for its original code
does not relicense these resources; CC BY 4.0 continues to apply to them.
