- Add some tests for conversion to/from WKT, using a bulk lot of testsdata
from PostGIS
- Add some tests for area/length calculation, using some test data and
results from PostGIS/geos unit tests
- Add tests for spatial relations, using test data from PostGIS. Note
that this required adding support for calculating the DE-9IM relation. I'll
expose this to users via the expression engine in 2.14.
Along the way this also fixes a number of bugs relating to WKT geometry
import, such as
- add support for alternate MultiPoint(1 1,2 2,...) format
- fix GeometryCollection to support collections with multi* children
and GeometryCollection children (allowed by spec)
