Tags give the ability to mark specific points in history as being important
drop --selftest, bugfixes, deal with US/* retirement
lowercase, arrow, import optimization, tzdata in selftest
IDL handling, config file sample install, --selftest information
overlap_show and show_table config file and accumulated changes
debian-specific release: add to Debian CI (autopkgtest)
human-readable tail, overlap, offsets, CI, black, flake8