Audformat

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* Added: ``audformat.Database.license``
* Added: ``audformat.Database.license_url``
* Added: ``audformat.Database.author``
* Added: ``audformat.Database.organization``
* Added: ``audformat.utils.intersect()`` for index objects
* Added: ``audformat.utils.union()`` for index objects
* Changed: ``Database.load()`` raises error if table file missing
* Changed: forbid duplicates in ``audformat`` conform indices
* Fixed: ``audformat.Table.__add__()`` returned wrong values
for some index combinations

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* Added: ``update_other_formats`` argument to ``audformat.Table.save()``
to make sure existing files in other formats are updated as well
* Changed: use ``round_trip`` argument when loading CSV files
to ensure dataframes are equal after storing and loading again

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* Fixed: implemented ``audformat.Database.__eq__`` and return ``True``
for identical databases

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* Changed: use nullable Pandas' type ``"boolean"`` for ``bool`` schemes
* Fixed: ``Scheme.draw()`` generates boolean values if scheme is ``bool``

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* Changed: add arguments ``num_workers`` and ``verbose`` to
``audformat.Database.load()``

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* Fixed: avoid sphinx syntax in CHANGELOG