- Update to 1.5.10
* #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.