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* Added the :meth:`DiffractionDataset.mask_apply` to modify the diffraction pattern mask.
* The center of diffraction is now calculated and updated as needed automatically.
* Better handling of write permissions.
* Added the :class:`MigrationWarning` and :class:`MigrationError` classes. Warnings/errors of these classes tell the user that migration should
be performed. This is automatically done by opening a :class:`DiffractionDataset` with writing permission. The GUI does this
automatically.
* Windows installers are now built with pynsist/NSIS instead of PyInstaller (15).
* `Support for Python 3.6 and NumPy<1.17 has been dropped <https://numpy.org/neps/nep-0029-deprecation_policy.html>`_
* Fixed an issue where creating the plug-in directory would rarely fail.