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Plot usage of stations from a file produced by glist

sh_glist_gmt usage:

sh_glist_gmt -gdlfile <experiment list> -rename <rename file> -window <lat/lon window>

  where:  <experiment list> -  Is a standard globk gdl file
          <rename file>     -  Is an optional globk rename file
          <lat/lon window>  -  Min lat, min lon, max lat max lon window coordinates

  example: sh_glist_gmt -gdlfile emed.gdl -rename emed.eq -window 30 20 45 55

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