Added support for sample and sampleBuffers to osg::GraphicsContext::Traits and

cleaned up the Traits naming

src/osg/GraphicsContext.cpp

@@ -15,6 +15,7 @@
 #include <osg/GraphicsContext>
 #include <osg/Notify>
 #include <map>
+#include <sstream>
 
 using namespace osg;
 
@@ -39,6 +40,14 @@ GraphicsContext* GraphicsContext::createGraphicsContext(Traits* traits)
 }
 
 
+std::string GraphicsContext::ScreenIdentifier::displayName() const
+{
+    std::stringstream ostr;
+    ostr<<hostName<<":"<<displayNum<<"."<<screenNum;
+    return ostr.str();
+}
+
+
 typedef std::map<unsigned int, unsigned int>  ContextIDMap;
 static ContextIDMap s_contextIDMap;
 static OpenThreads::Mutex s_contextIDMapMutex;