ace the Nodes of a tree. <p>
 
 It will place these nodes so that they symetrically fill each row. 
 This is simple to calculate but is not visually nice for most trees.<p></div>
<dl><dt><span class="strong">Version:</span></dt>
  <dd>$Revision: 1.4 $</dd>
<dt><span class="strong">Author:</span></dt>
  <dd>Malcolm F Ware (mfw4@cs.waikato.ac.nz)</dd></dl>
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