Michael Kuron authored 4 years ago and Markus Holzer committed 4 years ago

Some optional components use Boost MultiArray and PropertyTree, so we still include the headers if available.
We also still search std::experimental for any, filesystem and optional because some otherwise C++17-compliant compilers did not support them in std until recently.

The default target of \file is the current file.

- checking order of integrator
- checking energy conservation
- added semi implicit euler
- improved documentation
- playground for integrator analysis

If load balancing changes the neighborhood, caching of receive
buffers can lead to dead locks.

Since MSVC only has beta support for OpenMP 2.0 firstprivate
cannot be used for these compilers. However, firstprivate
is necessary for a reasonably safe implementation of OpenMP
in MESA-PD. The solution is to move OpenMP support to the
generator and disable OpenMP for the checked in version.
The waLBerla OpenMP guards are removed as they are no longer
needed. It is now assumed that if MESA-PD is generated with
OpenMP support it is about to be used. If OpenMP is disabled
with CMake warnings will pop up about undefined pragmas.

Moved from heat capacity to specific heat
to take into account individual mass of a particle.

To remove code duplication the distinction is now moved
into the generator. Default kernels are "with shape".

When processes contain no blocks after refinement the neighbor list
is not correctly reset.

Added hydrodynamic force notifications, introduced them to tests and benchmarks, minor documentation and include fixes

ForceTorqueNotification
HeatFluxNotification