Audb

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* Fixed: update removal version of deprecated stuff to 1.2.0

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* Added: ``audb.Dependencies._remove()``
* Changed: ``audb.Dependencies`` internally uses ``pd.DataFrame`` instead of ``dict``
* Changed: store dependencies with pickle to speed up loading
* Changed: versions of the same flavor share dependency file
* Changed: if possible ``audb.load()`` copies tables and media files from other versions in the cache
* Changed: ``audb.Dependencies._add_media()`` is now private
* Changed: ``audb.Dependencies._add_meta()`` is now private
* Changed: ``audb.Dependencies.is_removed`` renamed to ``audb.Dependencies.removed``
* Fixed: ``audb.load()`` considers format when searching the cache
* Fixed: ``audb.load()`` considers format when resolving missing media
* Fixed: ``audb.available()`` correctly returns versions of the same database from multiple repositories
* Fixed: add missing link to ``emodb`` example repository
* Removed: ``audb.Dependencies.data``

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* Changed: ``audb.Dependencies.bit_depth()`` now always returns an integer
* Changed: ``audb.Dependencies.channels()`` now always returns an integer
* Changed: ``audb.Dependencies.duration()`` now always returns a float
* Changed: ``audb.Dependencies.sampling_rate()`` now always returns an integer
* Fixed: ``audb.info.duration()`` for databases that contain files with a
duration of 0s
* Fixed: remove dependency to ``fire`` package

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* Fixed: docstring of ``audb.exists()`` falsely claimed that it was not
returning a boolean
* Fixed: several typos in documentation

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* Fixed: renamed ``latest_only`` argument of ``audb.available()``
to ``only_latest`` as it was before

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* Fixed: appearance of documentation TOC by requirering ``docutils<0.17``