Move unported exampels to unported-examples

examples/conftest.py

examples/wave/var-propagation-speed.py

examples/wave/wave-min.py

unported-examples/advection/advection.py

unported-examples/advection/var-velocity.py

unported-examples/advection/weak.py

unported-examples/benchmark_grudge/benchmark_mpi.py

unported-examples/benchmark_grudge/run_benchmark.sh

unported-examples/burgers/burgers.py

unported-examples/gas_dynamics/box-in-box.py

unported-examples/gas_dynamics/euler/sine-wave.py

unported-examples/gas_dynamics/euler/sod-2d.py

unported-examples/gas_dynamics/euler/vortex-adaptive-grid.py

unported-examples/gas_dynamics/euler/vortex-sources.py

unported-examples/gas_dynamics/euler/vortex.py

unported-examples/gas_dynamics/gas_dynamics_initials.py

unported-examples/gas_dynamics/lbm-simple.py

unported-examples/gas_dynamics/naca.py

unported-examples/gas_dynamics/navierstokes/shearflow.py

unported-examples/gas_dynamics/square.py