Add dependencies for extra tools

documentation/dependencies.html

@@ -102,6 +102,30 @@ We recommend using HTML5-compatible technology.
   <li>xajax </li>
   <li>jQuery</li>
 </ul>
+<h2>Extra features dependencies - server-side</h2>
+Chamilo LMS is a very complex software suite, and some of its components wil
+only work when some specific server-side libraries are installed. The names of
+the libraries below are taken from a Debian/Ubuntu installation, so you might
+need to adapt these if you are installing on Windows, Mac or another Linux
+distribution.<br />
+Please note that, as for the rest of free software, we are NOT giving or
+implying any warranty of any kind that this will work on your system, even on
+the intended Debian/Ubuntu systems. You should take your own precautions to
+ensure all components are installed by an expert in the field.<br />
+  <ul>
+    <li>Chamilo Rapid (ex Oogie(TM))</li>
+      <ul>
+        <li>libreoffice</li>
+      </ul>
+    <li>Audio recording</li>
+      <ul>
+        <li>libav-tools</li>
+      </ul>
+    <li>BigBlueButton videoconference</li>
+      <ul>
+        <li>bigbluebutton</li>
+      </ul>
+  </ul>
 </div>
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