Merge branch 'add-anarchy-pu' into 'master'

configure.ac

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

examples/SantaBarbara/make_plots.sh

examples/SantaBarbara/plotSmoothingLength.py

examples/SantaBarbara/plotSolution.py

examples/SantaBarbara/plotTempEvolution.py

examples/SantaBarbara/rhoTHaloComparison.py

examples/SantaBarbara/velociraptor_cfg.cfg

examples/SedovBlast_1D/plotSolution.py

examples/SodShock_1D/plotSolution.py

examples/SodShock_1D/sodShock.yml

examples/parameter_example.yml

src/debug.c

src/engine.c

src/hydro.h

src/hydro/AnarchyPU/hydro.h

src/hydro/AnarchyPU/hydro_debug.h

src/hydro/AnarchyPU/hydro_iact.h

src/hydro/AnarchyPU/hydro_io.h

src/hydro/AnarchyPU/hydro_part.h