<reductions>

[Joel E. Denny]

The XML output has two different elements named "reductions".  One reports 
reduce actions in the sense of productions performed by a bottom-up 
parser.  The other reports useless/unused symbols and rules that are found 
by the grammar reductions of reduce.c.

Perhaps we can choose a better name for the latter case.  
"grammar_reductions", "redundancies", any other suggestions?  Or perhaps 
the "useless" and "unused" elements don't need to be grouped together 
inside a parent element.  There's only one of each anyway.  Here's an 
example from Wojciech's web page:

  <reductions>
    <useless>
      <nonterminals>
        <nonterminal>useless</nonterminal>
      </nonterminals>
      <rules>
        <rule number="6">
          <lhs>useless</lhs>
          <rhs>
            <symbol class="terminal">STR</symbol>
          </rhs>
        </rule>
      </rules>
    </useless>
    <unused>
      <terminals>
        <terminal>STR</terminal>
      </terminals>
    </unused>
  </reductions>

What do you think?