Merge branch 'master' into mpi_stars2_matthieu

doc/RTD/source/ParameterFiles/parameter_description.rst

doc/RTD/source/SubgridModels/EAGLE/index.rst

doc/RTD/source/Task/index.rst

examples/Cooling/CoolingBox/coolingBox.yml

examples/Cooling/CoolingBox/energy_plot.py

examples/Cooling/CoolingBox/makeIC.py

examples/Cooling/CoolingBox/plotEnergy.py

examples/Cooling/CoolingBox/run.sh

examples/GiantImpacts/GiantImpact/run.sh

examples/HydroTests/VacuumSpherical_3D/getGlass.sh

examples/Makefile.am

...CosmoVolume/SmallCosmoVolume_cooling/plotTempEvolution.py

examples/SmallCosmoVolume/SmallCosmoVolume_cooling/run.sh

...smoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml

examples/SubgridTests/SupernovaeFeedback/getGlass.sh

examples/parameter_example.yml

src/collectgroup.c

src/collectgroup.h

src/cooling.h

src/cooling/Compton/cooling.h