Borgmatic

* 341: Add "temporary_directory" option for changing Borg's temporary directory.
* 352: Lock down systemd security settings in sample systemd service file.
* 355: Fix traceback when a database hook value is null in a configuration file.
* 361: Merge override values when specifying the "--override" flag multiple times. The previous
behavior was to take the value of the last "--override" flag only.
* 367: Fix traceback when upgrading old INI-style configuration with upgrade-borgmatic-config.
* 368: Fix signal forwarding from borgmatic to Borg resulting in recursion traceback.
* 369: Document support for Borg placeholders in repository names.

* 347: Add hooks that run for the "extract" action: "before_extract" and "after_extract".
* 350: Fix traceback when a configuration directory is non-readable due to directory permissions.
* Add documentation navigation links on left side of all documentation pages.
* Clarify documentation on configuration overrides, specifically the portion about list syntax:
http://torsion.org/borgmatic/docs/how-to/make-per-application-backups/#configuration-overrides
* Clarify documentation overview of monitoring options:
http://torsion.org/borgmatic/docs/how-to/monitor-your-backups/

* 300: Add "borgmatic export-tar" action to export an archive to a tar-formatted file or stream.
* 339: Fix for intermittent timing-related test failure of logging function.
* Clarify database documentation about excluding named pipes and character/block devices to prevent
hangs.
* Add documentation on how to make backups redundant with multiple repositories:
https://torsion.org/borgmatic/docs/how-to/make-backups-redundant/

* 336: Fix for traceback when running Cronitor, Cronhub, and PagerDuty monitor hooks.

* 327: Fix broken pass-through of BORG_* environment variables to Borg.
* 328: Fix duplicate logging to Healthchecks and send "after_*" hooks output to Healthchecks.
* 331: Add SSL support to PostgreSQL database configuration.
* 333: Fix for potential data loss (data not getting backed up) when borgmatic omitted configured
source directories in certain situations. Specifically, this occurred when two source directories
on different filesystems were related by parentage (e.g. "/foo" and "/foo/bar/baz") and the
one_file_system option was enabled.
* Update documentation code fragments theme to better match the rest of the page.
* Improve configuration reference documentation readability via more aggressive word-wrapping in
configuration schema descriptions.

* 292: Allow before_backup and similar hooks to exit with a soft failure without altering the
monitoring status on Healthchecks or other providers. Support this by waiting to ping monitoring
services with a "start" status until after before_* hooks finish. Failures in before_* hooks
still trigger a monitoring "fail" status.
* 316: Fix hang when a stale database dump named pipe from an aborted borgmatic run remains on
disk.
* 323: Fix for certain configuration options like ssh_command impacting Borg invocations for
separate configuration files.
* 324: Add "borgmatic extract --strip-components" flag to remove leading path components when
extracting an archive.
* Tweak comment indentation in generated configuration file for clarity.
* Link to Borgmacator GNOME AppIndicator from monitoring documentation.