iGraph</h4>
<ul>
  <li> Re-implement <tt>TMultiGraph::Fit</tt> using the functions defined in
      <tt>HFitImpl.cxx</tt>.
  <li> Add possibility to be used in the FitPanel (add a
       <tt>TMultiGraph::FitPanel()</tt> method).
  <li> Protection added in <tt>Draw()</tt>: "Cannot draw empty TMultiGraph".
</ul>

<h4>TGraphPainter</h4>
<ul>
<li> When a histogram was drawn in a larger frame than its limits (using the
  option "SAME"), the `outside' vertical lines for the first and last bins
  were not drawn. T