Emborg

- Improve the logging for composite configurations.
- Add support for [Borg-Space](https://github.com/KenKundert/borg-space), a utility that allows you to track and plot disk space usage for your *Borg* repositories over time.

- Improve the tests

- Added the *compare command*.
- Added the *manage_diffs_cmd* and *report_diffs_cmd* settings.
- Added the *run_before_first_backup* and *run_after_last_backup* settings.
- Allow files listed by *manifest* command to be constrained to those contained within a path.
- Allow relative dates to be specified on the *extract*, *manifest*, *mount* and *restore* commands.
- Allow *BORG_PASSPHRASE*, *BORG_PASSPHRASE_FD*, or *BORG_PASSCOMMAND* to dominate over *Emborg* passphrase settings.

- added *healthchecks_url* and *cronhub_url* settings.

- fix missing dependency.

- added support for healthchecks.io monitoring service.
- added support for cronhub.io monitoring service.