Fixes to osg::Texture's handling of anisotropy updating and

hardware generate mip mapping.

Added switching off generate mip map from osgText::Font.cpp.

Changed savedmodel.osg to saved_model.osg in ViewerEventHandler.

src/osgProducer/ViewerEventHandler.cpp

@@ -672,7 +672,7 @@ void DrawCallback::createStatsText()
 
 ViewerEventHandler::ViewerEventHandler(OsgCameraGroup* cg):
     _cg(cg),
-    _writeNodeFileName("savedmodel.osg"),
+    _writeNodeFileName("saved_model.osg"),
     _displayHelp(false),
     _frameStatsMode(NO_STATS)
 {