Digikam-db

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* Digikam.__init__: don't log sensitive data.
* BasicProperties: added get method.
* Imageinformation.orientation can be None.

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* Changes may break existing code.
* Image.caption returns string instead of tuple.
* ExifMeteringMode: Fixed typo in CENTER_WEIGHTED_AVERAGE.

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* Fixed exceptions when some ImageMetadata columns contain NULL.
* Fixed column names in nested tags check.

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* Fixed SQLAlchemy 2.0 compatibility issues.

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* Changed SQLAlchemy dependency to ~=1.4 as tests fail with 2.0.
* Added Sphinx as doc dependency.

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* First public release