Consider pybind11 as an alternative to Boost.Python

[sigurdstorve]

PyBind11 looks like a promising and more modern replacement for Boost.Python and has the advantage of being header-only. That would hopefully eliminate the need for locating NumPy headers in CMake etc.
REF: https://github.com/pybind/pybind11

Can it use Numpy arrays without copying? That is an important requirement.