Log Message:
sfeed: Update to 0.9.22

Changes:
0.9.22
------
* Fix a time parsing regression with the non-standard date format
  "2021-02-03 05:13:03" (without T). This non-standard format is now
  supported again.
* Fix/improve/refactor URI parsing and formatting. This now supports
  non-authoritive URI like "magnet:" links. local file URIs like \ 
file:/// are
  now also allowed (of course the user should be careful with file:/// URLs).
  This now follows the RFC standard more closely (but not completely):
  https://tools.ietf.org/html/rfc3986
* sfeed_update: just pass the feedurl directly as the base URL. This simplifies
  the code and allows for more correct transformation of relative URLs. Note
  though that feeds should not contain relative URLs though.
* sfeed_update: add an overridable parse() function, using sfeed(1) by default
  This can be useful to more cleanly make connector scripts.
* sfeed_update: restructure the code and allow to more easily reuse parts of
  the functions by including the script. Add an example script in the README
  to allow more efficient parallel execution using the non-POSIX xargs -P
  option.
* Documentation improvements: add examples, typo fixes, mandoc (lint) errors,
  etc.