Polish the documentation page.

views/default/documentations.html

 <h2 class="dbui-h2 dbui-small-cap">{{=T("Documentations")}}</h2>
 
-<p class="dbui-p dbui-small-cap">{{=T("For users")}}</p>
+<p class="dbui-p dbui-small-cap" style="margin-top: 5ex">
+    1. {{=T("For users")}}
+</p>
 <ul>
    <li class="dbui-p">
        <a href="/{{=request.application}}/static/docs/userguide/build/html/index.html" target="_blank">
@@ -15,7 +17,9 @@
    </li>
 </ul>
 
-<p class="dbui-p dbui-small-cap">{{=T("For developpers")}}</p>
+<p class="dbui-p dbui-small-cap" style="margin-top: 5ex">
+    2. {{=T("For developpers")}}
+</p>
 <ul>
    <li class="dbui-p">
        <a href="/{{=request.application}}/static/docs/epydoc/index.html" target="_blank">
@@ -28,7 +32,8 @@
            {{=request.application}} javascript API
        </a>
    </li>
-
+</ul>
+<ul>
    <li class="dbui-p">
        <a href="/{{=request.application}}/static/plugin_dbui/docs/epydoc/index.html" target="_blank">
            plugin_dbui python API
@@ -41,6 +46,19 @@
        </a>
    </li>
 
+   <li class="dbui-p">
+       <a href="https://marprod.in2p3.fr/plugin_dbui_book" target="_blank">
+           plugin_dbui reference manual
+       </a>
+   </li>
+</ul>
+<ul>
+   <li class="dbui-p">
+       <a href="http://web2py.com/book" target="_blank">
+           Web2py reference manual
+       </a>
+   </li>
+
    <li class="dbui-p">
        <a href="http://docs-origin.sencha.com/extjs/4.2.1/#!/api" target="_blank">
            Ext JS 4.2.1 javasript API
@@ -52,7 +70,8 @@
            Pandas data analysis toolkit
        </a>
    </li>
-
+</ul>
+<ul>
    <li class="dbui-p">
        <a href="http://epydoc.sourceforge.net/" target="_blank">
            Epydoc automatic API generation for python