Audformat

---------------------------

* Added: ``audformat.utils.hash()``
* Added: ``audformat.utils.expand_file_path()``
* Added: ``audformat.utils.replace_file_extension()``
* Changed: use ``yaml.CLoader`` for faster header reading

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* Added: ``as_segmented``, ``allow_nat``, ``root``, ``num_workers``
arguments to ``audformat.Table.get()``
* Added: ``as_segmented``, ``allow_nat``, ``root``, ``num_workers``
arguments to ``audformat.Column.get()``
* Added: ``files_duration`` argument
to ``audformat.utils.to_segmented_index()``
* Added: ``audformat.Database.files_duration()``
* Changed: changed default value of ``load_data`` argument
in ``audformat.Database.load()`` to ``False``
* Changed: speed up ``audformat.Database.files``
and ``audformat.Database.segments``
* Fixed: re-add support for ``pandas>=1.3``

---------------------------

* Added: support for Python 3.9
* Fixed: speed up ``audformat.utils.union()``
* Fixed: ``audformat.Column.set()`` with ``pd.Series``
and ``np.array`` for a scheme with fixed labels
and containing ``NaN`` values

---------------------------

* Removed: duration scheme and column
from conventions
and emodb example

---------------------------

* Added: custom ``BadKeyError`` when key is not found
* Changed: limit to ``pandas <1.3``
until it works again for newer ``pandas`` versions
* Changed: remove the ``<1.0.0`` limit for ``audiofile``
as a stable release is available and the API has not changed

---------------------------

* Added: ``audformat.utils.duration``
* Fixed: description of ``audformat.Database.is_portable``
in documentation