link to new gui tutorial about visualizing deformations

doc/gmsh.html

@@ -64,10 +64,13 @@ capabilities</a>.
       <a href="/gmsh/doc/texinfo/gmsh.txt">text</a>,
       <a href="/gmsh/doc/texinfo/gmsh-full.html">html</a> and 
       <a href="/gmsh/doc/texinfo/gmsh-info.tgz">info</a> formats)
-  <li>Graphical user interface tutorial: 
-      <a href="/gmsh/doc/gui_tutorial/">how to create a simple 2D model</a> 
-      (also available in
-      <a href="/gmsh/doc/gui_tutorial/gui_tutorial.pdf">pdf</a> format)
+  <li>Graphical user interface tutorials: 
+    <ul>
+      <li><a href="/gmsh/doc/gui_tutorial/">how to create a simple 2D model</a> 
+          (also available in <a href="/gmsh/doc/gui_tutorial/gui_tutorial.pdf">pdf</a> format)
+      <li><a href="/gmsh/doc/gui_tutorial_2/">how to visualize deformations</a> 
+          (also available in <a href="/gmsh/doc/gui_tutorial/gui_tutorial_2.pdf">pdf</a> format)
+    </ul>
   <li><a href="/gmsh/doc/FAQ">Frequently asked questions (FAQ)</a>
   <li><a href="/gmsh/doc/VERSIONS">Version history</a>
   <li><a href="/gmsh/doc/CREDITS">Credits</a>