- NearestNeighborFieldInterpolator::get needs to break out of all loops, just not the current one. While the test seemed to succeed anyway, it crashed with corrupted memory during exit when compiled with Intel 17 in Release mode.
- FftTest should not use thread-unsafe RNG in parallel section. Otherwise the Intel 16 compiler crashes.
- Revert to -openmp on Intel < 16.0.3, which crashes while processing some of our OpenMP loops (e.g. BoundaryHandling::treatDirection).

Also adds OpenMP support for macOS (requires Xcode 7.0, CMake 3.12 and separate libomp from MacPorts/Homebrew)

While it makes no sense to create these boundary types from a config file, geometry::initBoundaryHandling needs this function to be present for all boundary types in the boundary handling.

was only a debug check

this should be the common case

- fix find_package(MPI) when WARNING_ERROR is defined and recent version of CMake is used
- fix python_coupling Manager::addPath

Box
Capsule
Ellipsoid
Sphere

calcInertia of Sphere is called with the wrong argument order. The sphere moment of inertia is completely wrong.