option to plot error ellipses explicitly

Release notes

New option to plot ellipses in LH contour plots like this:

+Overlay.SM {
  <shape="ellipse">
  <style.title="SM (incl. uncertainties)">
  <style.legendDrawOptions="P">
  <style.markerStyle=20>
  <style.markerSize=1.5>
  <style.drawOption="CF">
  <style.fillColor=kMagenta>
  <style.markerColor=kMagenta>  
  <style.lineWidth=0.>
  <center.x=1>
  <radius.xu=0.02161018278497431>
  <radius.xd=0.02046948949045872>  
  <center.y=1>  
  <radius.yu=0.04220189569201838>
  <radius.yd=0.03391164991562634>          
}

Details