ADD: new track message, Entity class and Position class

libs/geographiclib/wrapper/python/PyGeographicLib.cpp

@@ -0,0 +1,21 @@
+#include <boost/python.hpp>
+#include <GeographicLib/Geoid.hpp>
+
+using namespace boost::python;
+using namespace GeographicLib;
+
+double EllipsoidHeight(Geoid& geoid,
+                       double lat, double lon, double hmsl) {
+  return hmsl + Geoid::GEOIDTOELLIPSOID * geoid(lat, lon);
+}
+
+BOOST_PYTHON_MODULE(PyGeographicLib) {
+
+  class_<Geoid, boost::noncopyable>("Geoid", init<std::string>())
+    .def("EllipsoidHeight", &EllipsoidHeight,
+         "Return geoid height:\n\
+    input: lat, lon, height_above_geoid\n\
+    output: height_above_ellipsoid")
+    ;
+
+}