     </table>
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<p>
<pre>
 Purpose
 =======</pre><p>
<pre>   Performs a symbolic factorization on a panel of columns [jcol, jcol+w).</pre><p>
<pre>   A supernode representative is the last column of a supernode.
   The nonzeros in U[*,j] are segments that end at supernodal
   representatives.</pre><p>
<pre>   The routine returns one list of the supernodal representatives
   in topological order of the dfs that generates them. This list is
   a superset of the topological order of 