Simultaneous dds loaded from python

[gkby79]

There are a few use-cases where people are using DDS as an aid for analysis in python for machine learning for bridge

One of the things which goes wrong is that people import (for example) bridgebots, endplay and redeal and use them for various functionality which is not shared between them.

On macOS 11.2 (but probably many other macOS) if two libraries are concurrently loaded, it seg-faults as soon as the second one is called, which seems to be a problem with threading, see

anntzer/redeal#15

[ThorvaldAagaard]

I have found that on MacOS 15.1 two calls to the library will fail if you call dds.SetMaxThreads(0) more than once