Thanks a lot for the ps_plot2d function:
Here is a pull request based on part of your code, slightly modified.
That should make the reviewing process easier.
The changes to maxima-menus.scm and my-init-texmacs.scm
were not obvious to me, so left aside.
Someone else with a better understanding of texmacs,
and a similar workflow as yours,
will have to review it.
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