1.39.0 new lib count

[SVN r52588]

index.html

@@ -55,7 +55,7 @@
 
   <h3>Changes in this release</h3>
 
-  <p>This release includes new libraries&nbsp;<b><span style="background-color: #FFFF00">???</span></b> as well as
+  <p>This release includes one new library&nbsp;(<a href="libs/signals2/index.html">signals2</a>) as well as
   updates to many existing libraries. See
   <a href="http://www.boost.org/users/history/version_1_39_0">Release
   History</a> for more information.</p>