Merge branch 'master' into multi_softening

configure.ac

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

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

examples/EAGLE_ICs/EAGLE_12/eagle_12.yml

examples/EAGLE_ICs/EAGLE_25/eagle_25.yml

examples/EAGLE_ICs/EAGLE_50/eagle_50.yml

examples/EAGLE_low_z/EAGLE_12/eagle_12.yml

examples/EAGLE_low_z/EAGLE_25/eagle_25.yml

examples/EAGLE_low_z/EAGLE_50/eagle_50.yml

examples/EAGLE_low_z/EAGLE_6/eagle_6.yml

...smoVolume/SmallCosmoVolume_cooling/small_cosmo_volume.yml

examples/main.c

examples/parameter_example.yml

src/Makefile.am

src/black_holes/Default/black_holes.h

src/black_holes/Default/black_holes_iact.h

src/black_holes/Default/black_holes_io.h

src/black_holes/EAGLE/black_holes.h

src/black_holes/EAGLE/black_holes_iact.h

src/black_holes/EAGLE/black_holes_io.h