update to geo_reader to improve interpolation for higher-resolution runs
update to geo_reader to improve interpolation for higher-resolution runs

Now tracks all possible polygons and the imprecision of any matches so that it
can select the most precise match, not just the first polygon that matches
to within the precision tolerance specified

gutmann/icar,gutmann/icar,NCAR/icar,gutmann/icar,NCAR/icar,NCAR/icar