Merging branch 'j.0'  into 'main'.

See merge request !2739

[a.cleanUpSWIG_nodeChildren] Hide vector of pointers and related methods from the SWIG Python API (#127)

Merging branch 'a.cleanUpSWIG_nodeChildren'  into 'main'.

The methods which produce a `std::vector<const INode*>`, `std::vector<const Layer*>` and `std::vector<const IReParticle*>` are hidden from the SWIG-produced Python API.

These methods are not needed for the Python interface.

Related to issue #127

See merge request !2738