This folder used to contain a bundled version of i-PI. However, the bundled version was not updated and thus had become outdated.
i-PI is now available via PyPi using the pip package manager at: https://pypi.org/project/i-PI/
Here are the commands to set up a virtual environment and install i-PI into it with all its dependencies.
python -m venv ipienv
source ipienv/bin/activate
pip install --upgrade pip
pip install i-PI
For further information, please consult the i-PI home page.