private/python_ipc_native: Add new function 'dbout'.

[alexvong243f]

Fixes #1210.

• inst/private/python_ipc_native.m: Add it.
• inst/private/python_header.py: Adjust accordingly.

[alexvong243f]

If this looks good, I'll merge it to https://github.com/cbm755/octsympy/tree/Array_not_Matrix and the matrclist* branch that I am working on.

[cbm755]

sure, looks good to me!

[cbm755]

Actually, you are correct: this should be merged to main.

[cbm755]

I'll merge it now and you can cherry-pick to any other branches you need.