Cleaned up osgTerrain, renaming the Terrain and Renderer class to

HeightFieldNode and HeightFieldRender to better reflect their function.
Removed the GeoMipMapRenderer.cpp stub as the implemention will be left
to a plugin.  Added Version functions.

src/osgTerrain/HeightFieldRenderer.cpp

@@ -0,0 +1,31 @@
+/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield 
+ *
+ * This library is open source and may be redistributed and/or modified under  
+ * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
+ * (at your option) any later version.  The full license is in LICENSE file
+ * included with this distribution, and on the openscenegraph.org website.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
+ * OpenSceneGraph Public License for more details.
+*/
+
+#include <osgTerrain/HeightFieldRenderer>
+
+using namespace osgTerrain;
+
+HeightFieldRenderer::HeightFieldRenderer():
+    _heightFieldNode(0)
+{
+}
+
+HeightFieldRenderer::HeightFieldRenderer(const HeightFieldRenderer& HeightFieldRenderer,const osg::CopyOp& copyop):
+    osg::Object(HeightFieldRenderer,copyop),
+    _heightFieldNode(0)
+{
+}
+
+HeightFieldRenderer::~HeightFieldRenderer()
+{
+}