Cooling almost correctly done and clean

README

docs/RST/libcooling.rst

docs/RST/pyswiftsim.rst

docs/conf.py

docs/index.rst

pyswiftsim/__init__.py

setup.py

src/cooling_wrapper.c

src/cooling_wrapper.h

src/libcooling.c

src/pyswiftsim_tools.c

src/pyswiftsim_tools.h

test/getCoolingTable.sh

test/test_cooling.py

test/test_cooling.yml