Added reverse_comm module

CMakeLists.txt

examples/dem_sd.py

examples/main.cpp

runtime/boundary_weights.cpp

runtime/boundary_weights.hpp

runtime/domain/ParticleDataHandling.hpp

runtime/domain/block_forest.cpp

runtime/domain/block_forest.hpp

runtime/domain/domain_partitioning.hpp

runtime/domain/regular_6d_stencil.cpp

runtime/domain/regular_6d_stencil.hpp

runtime/pairs.cpp

runtime/pairs.hpp

src/pairs/analysis/devices.py

src/pairs/code_gen/cgen.py

src/pairs/ir/loops.py

src/pairs/ir/properties.py

src/pairs/ir/variables.py

src/pairs/sim/comm.py

src/pairs/sim/domain_partitioning.py