Ddupdate

* Fix 21, broken ipv6 configuration file parsing.
* Documentation bugfixes.

* New cloudflare plugin, thanks to Mika Mannermaa <mmannermgmail.com>
* New dy.fi, restricted ti what looks like finnish addresses.
Thanks to Teemu Ikonen <tpikonengmail.com>
* Fix bug causing frequent updates due to cache misses (19).
Kudos: Teemu Ikonen
* Code and documentation cleanup.

* Fix crash when logging updates disabled by caching (11).
* afraid.org: Use now available https url (12).
* afraid.org: Support user-supplied addresses (13).
* Misc cleanup.

* New setup by ddupdate-config based on a user service. Nothing installed
as root, service runs as invoking user. Existing setups based on a
separate user running service continues to work, but must be maintained
manually.
* New service plugin dnspark.com
* New Hurricane Electric service plugin.
* New pkg-config build dependency.

* Multiple bugfixes in config script
* Add missing commands and short options to completions
* Move completions to proper /usr/share/bash-comletions/completions
* Drop sudo usage, use plain su instead.

* Add bash completion support
* Fix a bug in the user config file ~/.config/ddupdate.conf path.
* Fix Respect XDG_CONFIG_HOME (8).
* Fix handle .netrc permissions correct (7).
* Clean up the Makefile build-install-clean targets.
* Documentation re-organized and updated.