[Bornagain-announcements] Release 21.1

[Joachim Wuttke]

BornAgain 21.1 has been released.

It fixes a few issues in 21.0: In core,
- correct simulation background,
- disable yet unsupported alpha and lambda distributions
   in depth-probe and off-specular simulations,
- correct surface detection in depthprobe simulation
   with averaged particle layer.

In the GUI,
- restore full backward compatibility to 20.x,
- reenable linking a specular instrument to loaded data,
- correct q-units in 1D loader,
- prevent crash on applying wavelength distribution
   in specular scan.

There are also some improvements in GUI, namely
- show SLD units in the material editor,
- change default minimizer and the objective metric
   to "genetic" and "log" correspondingly,
- add new filtering options to 1D data loader.

All GUI project files and Python scripts from release 21
will continue to work.

Best greetings from the BornAgain maintainer team:

Ammar Nejati, Mikhail Svechnikov, Joachim Wuttke
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