This update for rdiff-backup fixes the following issues:

Update to 2.2.6:

* FIX: extended variables were not correctly written if content of file
        hadn't changed and file was read-only (API 201).
* FIX: failed parsing of arguments would return code 2 for warnings
        instead of 1 for errors
* FIX: quoting variables where not correctly propagated when set from
        the command line (API 201).
* FIX: some new functions were needed with higher security level and
        had to be sorted accordingly (API 201).
* FIX: test action would fail with empty error message when using API
        201
* FIX: timezone was not always correctly calculated in countries with
        historically changing DST, closes #902
* NEW: add environment variable RDIFF_BACKUP_API_VERSION to
        artificially modify the API version dictionary, see the man page for
        details.
* NEW: add warning that server will be called with deprecated CLI and
        how to avoid the corresponding warning (see also the FAQ)
* NEW: there is now a weekly release with changelog for intermediate
        testing available at
        https://github.com/rdiff-backup/rdiff-backup/releases/tag/weekly
* FIX: cross-version issue with 2.0.5 complaining about KeyError
        restrict_path, closes #872
* FIX: fail gracefully when connection(s) can't be setup e.g. in case
        of network error, closes #868

Update to 2.2.4:

* Only very small code and documentation fixes, hopefully
  really the last fix release of the stable branch 2.2, before
  the development effort for v2.4 starts.

Update to 2.2.3:

* Only small code and documentation fixes and additions,
  probably the last fix release of the stable branch 2.2,
  before the development effort for v2.4 starts.
* That's embarrassing but the last version still had a glitch
  and the sdist package `rdiff-backup-2.2.2.tar.gz` didn't
  contain the pre-rendered man-pages which some packagers
  requested.