This is needed to avoid different behaviour
between release and debug builds

Replace boost::{type_traits, enable_if and mpl} with standard library features where (easily) possible

Michael Kuron authored 6 years ago and Christoph Rettinger committed 6 years ago

Added functionality to LBM boundaries to optionally obtain the hydrodynamic force on those boundaries. Also added tests.

moved generic blockforest creation functions from pe/CreateWorld to blockforest/Initialization.h

use the general classes instead. they support levelwise load
balancing via a constructor parameter

default is levelwise for backward compatibility

This mainly includes an implementation for boost::uint_t::least.

Note: this could also be done with std::shared_ptr but would require
a custom deleter or std::default_delete for array types
(see also: https://stackoverflow.com/a/13062069).

Also, std::unique_ptr supports operator[] for array types.

Removed boost::array dependency in mpi::BufferDataTypeExtensions (was already partly done as part on #59)

- allows for nested execution flow (i.e. solver loop inside time loop)
- timing tree integration
- parallel CUDA stream support

- WALBERLA_BUILD_WITH_OPENMP was never defined

when compiling with undefined behaviour sanitizer and gcc 8.2
a -Werror=maybe-uninitialized warning appears when using the const refs
the std::move variant does not have this problem