this also requires to move default configuration files to share/ahriman.
Thus the following features have been added
* default configuration is not stored in /usr/share/ahriman/settings
* package installed via PKGBUILD now copies files from /usr
* configuration class now fallbacks to default in /usr
In current workflow you need to run setup to run init (because of
repository name), but you need to run init before setup (because of
repository tree rights).
New solution just add `Repo.init()` method call to setup subcommand
after config reload to make sure that repository name has been applied.
In addition chown method as well as setuid method for check_output have
been added.
move logic to separated shell scripts and also create shell script for
repository setup
Also force create directory according to systemd recommendations
