Add export of SDO_GEOMETRY column type. They are basically exported to the
non-constrained "geometry" type with SRID if defined. When configuration
directive AUTODETECT_SPATIAL_TYPE is enable, Ora2Pg will try to autodetect
the geometry type, the dimension and the SRID used to set a constrained
geometry type. For example, in the first case column shape with Oracle
type SDO_GEOMETRY will be converted as:

	shape geometry(GEOMETRY) or shape geometry(GEOMETRY, 4326)

and in the second case, with contrained geometry type:

	shape geometry(POLIGONZ, 4326)

with a three dimensional poligone.

Thanks to Vincent Picavet for the feature request and the specification.