 Matlab file
   ncfile   = NetCDF file for output
   basename = prefix for SWAN mesh, bathymetry, connectivity files
   first_time:  first time frame in Matlab object frame time
   last_time:   last time frame in Matlab object frame time
   increment:   increment in seconds
   isforcing:   converts NaNs from .mat file to 1.0's or 0.0's
   kn:          Nikuradse roughness in meters  [OPTIONAL, default = .01]
 OUTPUT:
    NetCDF file containing:
      a.) time in modified Julian day
      b.) significant wave