Setting up dddm

For most practical purposes, one can simply run pip install dddm to install it via https://pypi.org/project/dddm/.

For some implementations (MultiNest), one is adviced to follow instructions as on this script: https://github.com/JoranAngevaare/dddm/blob/master/.github/scripts/install_on_linux.sh

That said, as ultranest is an implemented and working alternative method to MultiNest, a pip setup may prove much simpler.