Added test harness and test 1 (sahsuland geog)

-- There is a fault in the original intersection where islands were not
handled correctly, so sahsuland_geography was updated
-- Note that the numbers now appear to be wrong!
--
-- \COPY sahsuland_geography(level1, level2, level3, level4) TO
'../sahsuland/data/sahsuland_geography.csv' WITH (FORMAT csv, QUOTE '"',
ESCAPE '\');
--
-- This algorithm implments the prototype in:
../postgres/gis_intersection_prototype.sql. The SAHSU alogoritm differs
in that
-- Where intersections overlap (e.g. level4 appears in more than 1
level3) the level3 with the greatest intersected area is chosen
-- This is differed to ARCGis - see the prototype file for a more
detailed investigation
--
-- \i ../postgres/gis_intersection_prototype.sql