Merging branch 'm.i20b'  into 'main'.

See merge request !2731

Merging branch 'm.fix_rough_seed'  into 'main'.

See merge request !2732

Merging branch 'a.cleanupSWIG'  into 'main'.

This is the first phase of the SWIG interface cleanup.

The second phase will be the discarding of the `disown` mechanism (used in the Python interface to `Sim` module) and removing the `clone` methods from the SWIG interface. Both are related to the exposure of C++ ownership-transfer mechanism to Python.

Related to issue 127

See merge request !2733

Merging branch 'm.i20a'  into 'main'.

See merge request !2730

Merging branch 'm.i20'  into 'main'.

See merge request !2729

Merging branch 'm.i875'  into 'main'.

See merge request !2728

Merging branch 'a.rmCpp20'  into 'main'.

See merge request !2727