added option to test constant eddy viscosity profile
new matlab files for makeing a kh-profile for testing.  Also plotvd to plot the result of a 1-D vertical test of the random walk
vd.nml - fiscm run control file for vertical diffusion test
vd_init.dat - initial particle position file for vertical diffusion test
changed make.inc to be an example file
Routine for
Added a bio routine for testing vertical diffusion
changes to allow for uniform sinking velocity - see testing/vd.nml
modified the spatial step used for estimating dK/dz in Vissers modified walk
previously we used delta_s = .05 which is too large in regions of large gradients
of the eddy diffusivity.  We are now using delta_s = .001 which produces a fairly
uniform distribution of individuals forced by a steady state eddy diffusivity profile
with double peaks (bbl and wind-driven layer)
merge