RFT plot improvements

* Make curve selection optional to avoid flickering in depth plots
* Replace undefined with zero for some curves
* Add spacing factor for min and max depth

ApplicationLibCode/UserInterface/RiuQwtPlotWidget.cpp

@@ -601,7 +601,11 @@ bool RiuQwtPlotWidget::eventFilter( QObject* watched, QEvent* event )
                  !m_clickPosition.isNull() )
             {
                 endZoomOperations();
-                selectClosestPlotItem( mouseEvent->pos(), toggleItemInSelection );
+
+                if ( m_plotDefinition->isCurveHighlightSupported() )
+                {
+                    selectClosestPlotItem( mouseEvent->pos(), toggleItemInSelection );
+                }
                 m_clickPosition = QPoint();
                 return true;
             }

ApplicationLibCode/UserInterface/RiuWellLogPlot.cpp

@@ -181,4 +181,5 @@ void RiuWellLogPlot::performUpdate( RiaDefines::MultiPlotPageUpdateType /* whatT
     int axisShift = alignCanvasTops();
     alignScrollbar( axisShift );
     alignAxes();
+    updatePlotLayouts();
 }