Add examples from 4.6 versions #37
Description
From clawpack-4.x/apps, see http://depts.washington.edu/clawpack/users-4.6/apps.html:
- acoustics/1d/example1/ as acoustics_1d_example1
- acoustics/1d/example2/ as acoustics_1d_example2
- acoustics/2d/example1/ as acoustics_2d_radial
- advection/1d/example1/ as advection_2d_outflow
- advection/2d/annulus/ as advection_2d_annulus
- advection/2d/example1_gauges/ as advection_2d_square
- advection/2d/swirl/ as advection_2d_swirl
- burgers/1d/sine2n/ as burgers_1d_sine2n
- burgers/2d/pwconst/ as burgers_2d_square
- euler/1d/hump/ as euler_1d_hump