oracle sdo converter: test for polygons with a combination of compound
and simple rings added
oracle sdo converter: support for polygons with a combination of
compound and simple rings implemented
oracle sdo converter: unit tests added, handling of multipolygons fixed
and limited support for unknown rings implemented.
oracle sdo converter: support for unknown rings implemented
commented out method (toTimeParticle) removed from
OraclePrimitiveConverter
oracle sdo converter: comments added
Merge pull request #289 from IDgis/3.4-oracle-sdo-improvements

3.4 oracle sdo improvements