* Fix flake8 errors

* flake8: ignore E203

* flake8: 119 cols for now

* black

* fix comment style

* exclude cmake.py

* clang-format: sort include

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

Getting eigenpy (and pinocchio) to compile on macOS with python3 took me some effort. The required trick turned out to "only" add `-DPYTHON_EXECUTABLE=\`which python3\`` to the cmake argument.

Do you think this is worth adding to the README.md/installation instructions? I am happy to provide something similar for pinocchio as well.