Emborg

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- Fix missing dependency.

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- Added support for `healthchecks.io <https://healthchecks.io>`_ monitoring
service.
- Added support for `cronhub.io <https://cronhub.io>`_ monitoring service.

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- Made extensive changes to :ref:`manifest <manifest>` command to make it more
flexible

- colorized the output based on file health (green implies healthy, red
implies unhealthy)
- added ``--no-color`` option to :ref:`manifest <manifest>` to suppress
colorization
- added :ref:`colorscheme` setting.
- added :ref:`manifest_default_format` setting.
- added support for *Borg* *list* command field names for both reporting
and sorting.
- added *Emborg* variants to some of the *Borg* field names.
- added ``--show-formats`` command line option.
- added ``--format`` command line option.
- added ``--sort-by-field`` command line option.
- change predefined formats to use fields that render faster

.. warning::
These changes are not backward compatible. If you have
a :ref:`manifest_formats` setting from a previous version, it may
need to be updated.

- It is now an error for :ref:`prefix` setting to contain ``{{now}}``.
- :ref:`Settings <settings>` command will now print a single setting value
if its name is given.

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- Add ``--progress`` command-line option and :ref:`show_progress` option to
the :ref:`create <create>` command.

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- Added ``--list`` command-line option to the :ref:`prune <prune>` command.

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- Added ``--repo`` option to :ref:`delete <delete>` command.
- Added ``--relocated`` global command-line option.
- *Emborg* now automatically confirms to *Borg* that you know what you are doing
when you delete a repository or repair an archive.