[Bornagain-announcements] Release 20.0

[Joachim Wuttke]

BornAgain 20.0 has been released.

The jump from 1.19 to 20.0 warrants some explanation, which will be given below.

This release, the result of two years of intense work, brings huge changes at 
all levels.

Much of this release is about “refactoring”, i.e. internal changes that set data 
structures and internal interfaces right to prepare for future extensions.

Among the user-facing changes, most noticeable is the replacement of the 
graphical sample editor by expandable tables.

Also, there are numerous changes to the Python API. Unfortunately, this means 
that most old scripts will be broken. We recognize the importance of backward 
compatibility, which we hope to gradually achieve in forthcoming releases.

The restructured documentation has now three distinct sections for Python 
scripting: a short tutorial, a collection of examples, and a reference. 
Migration to this new structure is still incomplete; some reference sections are 
still in old teaching-by-example style, and will be reworked later.

As another deployment channel, we are now supporting Python-only installation 
via the Python Package Index https://pypi.org.

For more details, see the CHANGELOG.

In spite of thorough testing, it is not unlikely that some bugs slipped in. If 
you suspect a bug or observe any other undesirable behavior, please submit a 
report to our issue tracker. We will investigate any such report with high 
priority, and publish hotfix releases as appropriate.

With this release, the version number scheme changed. Recognising that there 
will be never be the right moment to pass from BornAgain 1.x.y to 2.0.0, we 
removed the leading “1” for good, and promoted the old minor to new major. In 
the future, new major releases shall be published several times per year.

We thank Randolf Beerwerth, Ludwig Jäck, Andrew McCluskey, Tobias Knopff, and 
especially Matthias Puchner for their contributions to this release.

Best greetings from the new BornAgain maintainer team:

Ammar Nejati, Mikhail Svechnikov, Joachim Wuttke
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