Big update for planetary stuff

.gitignore

configure.ac

examples/MoonFormingImpact/README.md

examples/MoonFormingImpact/get_init_cond.sh

examples/MoonFormingImpact/moon_forming_impact.yml

examples/MoonFormingImpact/plot.py

examples/MoonFormingImpact/run.sh

examples/UranusImpact/README.md

examples/UranusImpact/get_init_cond.sh

examples/UranusImpact/plot.py

examples/UranusImpact/run.sh

examples/UranusImpact/uranus_impact.yml

examples/parameter_example.yml

src/cell.c

src/debug.c

src/engine.c

src/engine.h

src/equation_of_state/planetary/aneos.h

src/equation_of_state/planetary/equation_of_state.h

src/equation_of_state/planetary/get_eos_tables.sh