improves the handling and differentiation of cronjobs and systemd timers.
Rename the ``restic_create_cron`` variable to``restic_create_schedule``.
Now new: ``restic_schedule_type: "systemd"``.
RESOLVE#22
* Added support for basic logging of backup result
* Added changelog entry
* Added full output logging
* Changed logging date format to include the time as well as the date
* Fixed error on backup script creation if enable_logging was not specified for a backup job
* Improved backup script by removing duplicate code
* Added variable restic_log_dir to the readme