Renamed the osg::EarthSky to osg::ClearNode to make it more obvious what

role it has play and make it more relevant to non vis-sim applications.

src/osg/ClearNode.cpp

@@ -1,13 +1,13 @@
-#include <osg/EarthSky>
+#include <osg/ClearNode>
 
 #include <algorithm>
 
 using namespace osg;
 
 /**
- * EarthSky constructor.
+ * ClearNode constructor.
  */
-EarthSky::EarthSky()
+ClearNode::ClearNode()
 {
     StateSet* stateset = osgNew StateSet;
     stateset->setRenderBinDetails(-1,"RenderBin");

src/osg/Makefile

@@ -26,7 +26,7 @@ CXXFILES =\
 	DOFTransform.cpp\
 	Drawable.cpp\
 	DrawPixels.cpp\
-	EarthSky.cpp\
+	ClearNode.cpp\
 	Fog.cpp\
 	FrameStamp.cpp\
 	FrontFace.cpp\