Plot Cosmetics Update

Update to a number of plots to align with
the flatter, less cluttered chart style
used elsewhere (Ride, Histogram, CP et al).

Changes made are purely cosmetic and apply
to:

* Aerolab
* HrPw
* Realtime, ErgFile
* Weekly Summary

src/ErgFilePlot.cpp

@@ -44,6 +44,7 @@ ErgFilePlot::ErgFilePlot(QList<ErgFilePoint> *data)
 
     //insertLegend(new QwtLegend(), QwtPlot::BottomLegend);
     setCanvasBackground(Qt::white);
+    canvas()->setFrameStyle(QFrame::NoFrame);
     courseData = data;                      // what we plot
     Now = 0;                                // where we are