plotting geo_em.d[nn].nc topography from WPS files
  draw_topo_geogrid(ncfile, values)
    ncfile= geo_em.d[nn].nc file to use
    values= [minTopo],[maxTopo]:[lonlatL]:[title]:[graphic_kind]:[mapvalues]
      [min/max]Topo: minimum and maximum values of topography to draw
      lonlatL: limits of longitudes and latitudes [lonmin, latmin, lonmax, latmax] or None
      title: title of the graph ('!' for spaces)
      graphic_kind: kind of figure (jpg, pdf, png)
    mapvalues: map characteristics [proj],[res]
      see full documentation: http://matplotlib.org/basemap/
      [proj]: projection
        * 'cyl', cilindric
        * 'lcc', lambert conformal
      [res]: resolution:
        * 'c', crude
        * 'l', low
        * 'i', intermediate
        * 'h', high
        * 'f', full
    close: Whether figure should be finished or not