Part of issue #48

Add fine/coarse overlap regions boundaries and fluid cells have to be setup according to the coarse grid resolution.

Michael Kuron authored 7 years ago and Christian Godenschwager committed 7 years ago

API changes in blockforest::PhantomBlockForest, blockforest::loadbalancing, pe::amr::weight_assignment
mpi can now only send/receive walberla::optional instead of boost::optional

Michael Kuron authored 7 years ago and Christian Godenschwager committed 7 years ago

API change for vtk::VTKOutput::getFilenames

Also remove some unneeded boost includes

[API]: changed body mapping functions: removed most of them, added mapping-decider function, accomodated changes to test cases, added new mapping test case

[API]: changed pe coupling mapping functions interfaces, added new mapping functions, adapted test cases and benchmarks

- normal CMake Python search can be used if the python interpreter is
  searched before the searching the libraries

second tutorial added
updated older tutorials
made tutorials also tests

two versions available now via CMake switch:
   - by default the Python module is built without LBM module, since
     lbmpy can be used for this. Reduces compile time substantially.
   - if the LBM is needed in python, for example for the lbmpy testsuite
     it can be included by setting the CMake switch
     WALBERLA_BUILD_WITH_PYTHON_LBM

If you have access to the old closed source waLBerla repository, you may restore the complete history with the following command
git fetch git@i10git.cs.fau.de:software/walberla.git 'refs/replace/*:refs/replace/*'