Digikam-db

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* Better parsing of AlbumRoot.identifier

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* AlbumRoot.mountpoint emits a warning when trying to determine mount point
on other systems than Linux.

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* New ``ExifExposureProgram`` value ``BULB``
(unofficial, but used by Canon).
* ``DigikamImageInformation.colorModel`` returns numeric value if
it is not a valid ``ImageColorModel``.

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* ``Tags.add()`` accepts hierarchical tag names.
* Replaced ``DigikamObjectNotFound`` and ``DigikamMultipleObjectsFound`` with
``DigikamObjectNotFoundError`` and ``DigikamMultipleObjectsFoundError``. The
old exceptions are still present for compatibility, but will be removed in
the future.
* Changed capitalize() in enum string representations to title().

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* Reader-friendly string conversions for Exif classes.
* Made ``ExifFlash`` more standards-conforming (may break existing code if
``function`` attribute is used).

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* Added support for MySQL without nested sets in `Tags` (DBVersion > 10).
* Raise ``DigikamVersionError`` when trying to access properties not supported
by the used database version.
* Added ``Album.modificationDate`` and ``AlbumRoot.caseSensitivity``.