Add 2D uniform box and rename test-cases to indicate the dimensionality

examples/PerturbedBox_2D/makeIC.py

examples/PerturbedBox_2D/perturbedPlane.yml

examples/PerturbedBox_3D/makeIC.py

examples/PerturbedBox_3D/perturbedBox.yml

examples/PerturbedBox_3D/run.sh

examples/SedovBlast_3D/makeIC.py

examples/SedovBlast_3D/makeIC_fcc.py

examples/SedovBlast_3D/profile.py

examples/SedovBlast_3D/rdf.py

examples/SedovBlast_3D/run.sh

examples/SedovBlast_3D/sedov.py

examples/SedovBlast_3D/sedov.yml

examples/SedovBlast_3D/solution.py

examples/SodShock_3D/glass_001.hdf5

examples/SodShock_3D/glass_002.hdf5

examples/SodShock_3D/makeIC.py

examples/SodShock_3D/rhox.py

examples/SodShock_3D/run.sh

examples/SodShock_3D/sodShock.yml

examples/SodShock_3D/solution.py