Second experiment from White, Adcroft and Hallberg, 2009. http:https://dx.doi.org/10.1016/j.jcp.2009.08.016
Internal wave "sloshing" in a box, using continuous-rho coordinates,
from section 5.3.

mk_plots.m	- generates following plot
results.png	- initial conditions and end state (see Fig. 9)