we're proud to announce the first bugfix release for the 2.2 series of darktable, 2.2.1!

as always, please don't use the autogenerated tarball provided by github, but only our tar.xz. the checksum is:

    $ sha256sum darktable-2.2.1.tar.xz
    ???  darktable-2.2.1.tar.xz
    $ sha256sum darktable-2.2.1.dmg
    ???  darktable-2.2.1.dmg

and the changelog as compared to 2.2.0 can be found below.

## New features:

- Show a dialog window that tells when locking the database/library failed
- Ask before deleting history stack from lightable.
- preferences: make features that are not available (greyed out) more obvious

## Bugfixes:

- Always cleanup undo list before entering darkroom view. Fixes crash when using undo after re-entering darkroom
- Darkroom: properly delete module instances. Fixes rare crashes after deleting second instance of module.
- Levels and tonecurve modules now also use 256 bins.
- Rawoverexposed module: fix visualization when a camera custom white balance preset is used

## Base Support:

- Canon EOS M5
