e  = filename to dump to
   mytitle   = title of the case (set as global attribute)
   cbcmin    = minimum value of CBC (optional, defaults to 0.0018 if
               omitted).

 OUTPUT:
    netCDF file called `filename'

 EXAMPLE USAGE
    write_FVCOM_z0(z0field, 'tst_z0.nc', 'z0 tst domain')

 Author(s):
    Geoff Cowles (University of Massachusetts Dartmouth)
    Pierre Cazenave (Plymouth Marine Laboratory)

 Revision history
    2012-06-15 Added support for native MATLAB NetCDF routines. Requires
    M