added multi_index

[SVN r23256]

index.htm

@@ -120,6 +120,10 @@
 
                         <h3> ??? - Version 1.3?.?</h3>
                         <ul>
+                          <li><a href="libs/multi_index/doc/index.html">Multi-index
+                          Containers Library</a> added - Containers with multiple
+                          STL-compatible access interfaces,
+                          from Joaqu&iacute;n M L&oacute;pez Mu&ntilde;oz.</li>                          
                           <li><a href="doc/html/program_options.html">Program
                           Options Library</a> added - access to configuration
                           data given on command line, in config files and other