Add AutoIndex to tools index.

[SVN r76275]

tools/index.html

@@ -86,6 +86,11 @@
 		   preprocessor usable on top of any other compiler. Usable for instance for the debugging 
 		   of the expansion of macros in your code or as a replacement for your built-in 
 		   preprocessor. <br>
+         &nbsp;
+         <li>
+           <a href="auto_index/index.html">AutoIndex</a> - A tool for indexing Boostbook/Docbook
+           documents. <br>
+         &nbsp;
       </li>
    </ul>
       <hr>