Added support for decoration of the osgTerrain::DataSet generated databases

with a CoordinateSystemNode which reflect the coordinate system of the
database.

Added support for reading and writing CoordianteSystemNode into the .osg
and .ive formats.

src/osgPlugins/osg/CoordinateSystemNode.cpp

@@ -0,0 +1,60 @@
+#include "osg/CoordinateSystemNode"
+
+#include "osgDB/Registry"
+#include "osgDB/Input"
+#include "osgDB/Output"
+
+using namespace osg;
+using namespace osgDB;
+
+// forward declare functions to use later.
+bool CoordinateSystemNode_readLocalData(Object& obj, Input& fr);
+bool CoordinateSystemNode_writeLocalData(const Object& obj, Output& fw);
+
+// register the read and write functions with the osgDB::Registry.
+RegisterDotOsgWrapperProxy g_CoordinateSystemNodeProxy
+(
+    new osg::CoordinateSystemNode,
+    "CoordinateSystemNode",
+    "Object Node CoordinateSystemNode Group",
+    &CoordinateSystemNode_readLocalData,
+    &CoordinateSystemNode_writeLocalData
+);
+
+bool CoordinateSystemNode_readLocalData(Object& obj, Input& fr)
+{
+    bool iteratorAdvanced = false;
+
+    CoordinateSystemNode& csn = static_cast<CoordinateSystemNode&>(obj);
+
+    if (fr.matchSequence("CoordinateSystem %s"))
+    {
+        const char* str = fr[1].getStr();
+        if (str) csn.setCoordinateSystem(str);
+
+        iteratorAdvanced = true;
+        fr+=2;
+    }
+
+    static ref_ptr<EllipsoidModel> s_ellipsoidModel = new EllipsoidModel;
+    
+    EllipsoidModel* em = static_cast<EllipsoidModel*>(fr.readObjectOfType(*s_ellipsoidModel));
+    if (em) csn.setEllipsoidModel(em);
+
+    return iteratorAdvanced;
+}
+
+
+bool CoordinateSystemNode_writeLocalData(const Object& obj, Output& fw)
+{
+    const CoordinateSystemNode& csn = static_cast<const CoordinateSystemNode&>(obj);
+
+    fw.indent()<<"CoordinateSystem "<<fw.wrapString(csn.getCoordinateSystem())<<std::endl;
+    
+    if (csn.getEllipsoidModel()) 
+    {
+        fw.writeObject(*csn.getEllipsoidModel());
+    }
+
+    return true;
+}