[Bornagain-announcements] hotfix release 20.2

[Joachim Wuttke]

BornAgain 20.2 has been released. It resolves a number of bugs.
Full compatibility with 20.0 is maintained for Python scripts
and for GUI project files.

Release number 20.1 has been skipped: While we had already
published some artifacts of 20.1, another serious bug was
reported to us. So we repaired that bug immediately, and
restarted the release procedure with a fresh version number.

That long-standing bug caused incorrect vertical positioning
when option UseAverageMaterial was applied to multi-particle
layouts or particle distributions.

Another long-standing bug was the incorrect absolute intensity
of scattering from rough interfaces, following a misprint
(k^2 instead of k^4) in a paper we had relied on. Now, finally,
scattering from roughness and from nanoparticles is correctly
computed on the same absolute scale.

An important hotfix is the repair of the GUI support for angular
reflectivity scans, broken by a bug introduced in 20.0.

We still do not support roughness in polarized computations.
At least, if this combination is encountered, we now raise
a proper error message.

Thanks to Liz Margarita Montanez Huaman and Timo Fuchs for bug reporting.

Ammar Nejati, Mikhail Svechnikov, Joachim Wuttke
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