Moving Gboxes to IO

src/CSVWriter/CSVWriter.hpp

src/GraphMLWriter/GraphMLWriter_unit_tests.hpp

src/HDF5_wr/HDF5_reader.hpp

src/HDF5_wr/HDF5_wr.hpp

src/HDF5_wr/HDF5_writer.hpp

src/Makefile.am

src/VTKWriter/VTKWriter_vector_box.hpp

src/util.hpp