Merging branch 'j.4'  into 'main'.

See merge request !2855

Merging branch 'm.1'  into 'main'.

See merge request !2853

Merging branch 'm.0'  into 'main'.

See merge request !2851

Merging branch 'm.0'  into 'main'.

See merge request !2850

Merging branch 'm.0'  into 'main'.

See merge request !2848

Merging branch 'j.3'  into 'main'.

See merge request !2847

Merging branch 'j.2'  into 'main'.

See merge request !2846

Merging branch 'm.0'  into 'main'.

See merge request !2845

Merging branch 'm.0'  into 'main'.

See merge request !2844

Merging branch 'm.0'  into 'main'.

See merge request !2843

Merging branch 'm.0'  into 'main'.

See merge request !2842

[a.fixFabio] PyInterpreter: fx Python memory management regarding new and borrowed references; improve error messaging (Closes #1063 and #1070)

Merging branch 'a.fixFabio'  into 'main'.

See merge request !2839

Merging branch 'm.0'  into 'main'.

See merge request !2841

Merging branch 'j.2'  into 'main'.

See merge request !2840

The error message reporting and traceback is corrected and improved.
The full error report is displayed in the GUI and sent to stderr.

Example (stderr):
```
---PyInterpreter: Error:
PyInterpreter:BornAgain: Failed executing Python function 'get_sample'
------------------------------
* Python exception:
No module named 'noneexistantpackage'

Traceback (most recent call last):

  File "<string>", line 6, in get_sample

ModuleNotFoundError: No module named 'noneexistantpackage'

------------------------------
* Runtime environment:
------------------------------
```

Resolves issue #1063