Add support for shifted and rotated geographic coordinate system

[baagaard-usgs]

Create a new CoordSys object that implements a georeferenced coordinate system with a shift and rotation added on the end.

• Create CSGeoLocal C++ object that derives from CSGeo
• Add localToGeographic() and geographicToLocal() to CSGeo and CSGeoLocal
• Update Converter::_convert to use localToGeographic() and geographicToLocal()
• Add C++ unit tests for CSGeoLocal
• Add C++ unit tests for Converter using CSGeoLocal
• Add SWIG code for CSGeoLocal
• Add Pyre code for CSGeoLocal
• Add documentation for CSGeoLocal, including diagram