Note: As of November 2001 we are not using the standard scrip1.4
version of convertPOPT, but have nonstandard code to use the
ccsm_pop/cice calculation of T-grid cell center locations, and we use
Keith's nonstd calculation of southern-most points. I'm getting this
code from 
  /fs/cgd/home0/hecht/csm/fortran/SCRIP/scrip1.4/grids/convertPOPT.f
This file is under revision control, in 
  /home/hecht/my_cvs/SCRIP/scrip1.4/grids/convertPOPT.f,v

In grids subdir,
produce gx3v2_011112.nc from:

   convertPOPT

Add documentation:

   ncatted -O -h -a Created_by,global,a,c,"`whoami`, `date`" gx3v2_011112.nc
   ncatted -O -h -a 1D_grid_indexing,global,a,c,"if n is 1D index, i runs fast, j runs slow: n=(j-1)*fast_grid_dim+i" gx3v2_011112.nc

--Matthew Hecht