Various fixes to constructors to ensure that all variables are initialized.

src/osgGLUT/Viewer.cpp

@@ -117,7 +117,8 @@ Viewer::Viewer()
 
     _initialTick = _timer.tick();
     _frameTick = _initialTick;
-    frRate=0; // added by gwm to display fram Rate smoothed
+    _lastFrameTick = _initialTick;
+    frRate=0;
 
     _focusedViewport = 0;         // The viewport with mouse/keyboard focus
     
@@ -125,6 +126,19 @@ Viewer::Viewer()
     _frameStamp = osgNew osg::FrameStamp;
     
     _displaySettings = osgNew osg::DisplaySettings;
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 }