Merge branch 'format' into 'master'

src/chemistry/GEAR/csds_chemistry.c

src/chemistry/GEAR/csds_chemistry.h

src/chemistry/none/csds_chemistry.c

src/chemistry/none/csds_chemistry.h

src/csds_header.c

src/csds_index.c

src/csds_index.h

src/csds_loader_io.c

src/csds_loader_io.h

src/csds_logfile.c

src/csds_logfile.h

src/csds_parameters.c

src/csds_parameters.h

src/csds_particle.c

src/csds_particle.h

src/csds_python_tools.h

src/csds_python_wrapper.c

src/csds_reader.c

src/csds_reader.h

src/csds_reader_generate_index.c