This validation program integrates Orr-Sommerfeld eigenfunctions with a 
linearized DNS. It outputs the DNS data and data from the analytic 
expression for Orr-Sommerfeld growth. The matlab script orrsomm_movie.m
produces an mpg movie that compares the DNS and analytic eigenfunctions
as the vary in time.

The full velocity fields are

  u(x,y,z,t) = u_{10}(y,t) exp(2pi i x/Lx) + complex conjugate

where u_{10} is the complex, vector-valued kx,kz=1,0 Fourier transform
of u. The movie shows u_{10}(y,t) as it varies in t, for DNS and analytic.