Ietfdata

- Add Meeting::status() method

- Update tests

- Work around problems with Datatracker dropping connections when
HTTP connection reuse is active
- Catch-up with changes to Datatracker API
- Catch-up with changes to RFC index format

- Catch-up with Datatracker Version 6.101.0. This added IANA expert review
tracking, with additional states.

- Fix license metadata

- Initial release