Audformat

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* Added: ``audformat.utils.join_schemes``

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* Added: ``Database.is_portable``
* Added: ``copy_media`` argument to ``Database.update()``
* Changed: remove ``root`` argument from ``testing.create_audio_files()`` and instead use ``Database.root``
* Fixed: ``utils.concat()`` converts to nullable dtype
* Fixed: ``utils.concat()`` returns ``DataFrame`` if input contains at least one ``DataFrame``

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Note: tables stored from this version upwards cannot be loaded with older versions

* Added: ``Database.root``
* Added: ``utils.join_labels()``
* Added: ``Scheme.replace_labels()``
* Changed: set dependency to ``pandas>=1.1.5``
* Changed: do not compress pickled table files

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* Changed: ``allow_nat`` argument to ``utils.to_segmented_index()``

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* Fixed: ``audformat.assert_index()`` checks for correct dtypes

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* Added: ``audformat.Database.update()``
* Added: ``audformat.Table.update()``
* Added: ``overwrite`` argument to ``audformat.utils.concat()``
* Changed: result of ``audformat.Table.__add__()`` is no longer assigned to a ``audformat.Database``