math → comm Relation

File in src/math	Includes file in src/comm
graph / fn_Graph_ParMETIS.cpp	commtools.hpp
graph / fn_Graph_PTSCOTCH.cpp	commtools.hpp
graph / fn_Graph_SCOTCH.cpp	commtools.hpp
graph / graphtools.hpp	commtools.hpp
tensor / example_udfiber.cpp	cl_Communicator.hpp