- 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

Add forgotten incrementor in iterator macro

See merge request walberla/walberla!171

Fix typo in iterator macros

See merge request walberla/walberla!169

Use for loops instead of while loops in iterator macros

See merge request walberla/walberla!168

- for example conda ships this old MPI version

Su Viscoelasticity

See merge request walberla/walberla!146

Fix VTK output for bodies with infinite mass

See merge request walberla/walberla!167

Only call MPI_Finalize if we actually called MPI_Init

See merge request walberla/walberla!166

Call target_link_libraries with PUBLIC keyword if necessary

See merge request walberla/walberla!164

CMake: Make doc target and additional CXX warning flags switchable

See merge request walberla/walberla!165

Remove boost::bind from tutorial

See merge request walberla/walberla!161

remove mscv 2015 from ci and use cuda 9.0 in ubuntu 16.04

Closes #79

See merge request walberla/walberla!162

remove clang 3 and intel 2016

Closes #79

See merge request walberla/walberla!160

Resolve "Replace deprecated CUDA APIs"

Closes #71

See merge request walberla/walberla!157

- information from CMake to codegen: double/float, OpenMP, ...

- More flexibility for the user to implement custom checkpointing

MPICH2 apparently expects a non-const pointer for blocklenghts whereas
other MPIs expect const pointer -> removed const to work with all