Merge branch 'lean_gravity' into 'master'

configure.ac

examples/AgoraDisk/agora_disk.yml

examples/AgoraDisk/plotSolution.py

examples/DiscPatch/GravityOnly/disc-patch.yml

examples/DiscPatch/GravityOnly/makeIC.py

examples/DiscPatch/HydroStatic/disc-patch-icc.yml

examples/DiscPatch/HydroStatic/disc-patch.yml

examples/DiscPatch/HydroStatic/makeIC.py

examples/DiscPatch/HydroStatic_1D/disc-patch-icc.yml

examples/DiscPatch/HydroStatic_1D/makeIC.py

examples/EAGLE_100/eagle_100.yml

examples/EAGLE_100/run.sh

examples/EAGLE_12/eagle_12.yml

examples/EAGLE_12/run.sh

examples/EAGLE_25/eagle_25.yml

examples/EAGLE_25/run.sh

examples/EAGLE_50/eagle_50.yml

examples/EAGLE_50/run.sh

examples/EAGLE_6/eagle_6.yml

examples/EAGLE_6/run.sh