Merge branch 'new_implementation' into 'master'

.gitlab-ci.yml

examples/cooling_box/CloudyData_UVB=HM2012.h5

examples/cooling_box/cooling.yml

examples/cooling_box/generate_grackle_data.py

examples/cooling_box/getCoolingTable.sh

examples/cooling_box/plot_cooling.py

examples/cooling_box/run.sh

examples/cooling_rate/cooling.yml

examples/cooling_rate/generate_grackle_data.py

examples/cooling_rate/plot_cooling.py

examples/cooling_rate/run.sh

pyswiftsim/dev.py

pyswiftsim/structure.py

src/chemistry_wrapper.c

src/chemistry_wrapper.h

src/cooling_wrapper.c

src/cooling_wrapper.h

src/cosmology_wrapper.c

src/cosmology_wrapper.h

src/parser_wrapper.c