!! VERY UNSTABLE CHANGESET !!

Many updates in this commit:
 * first work on the webmail plugin, for now only emails listing and folders browsing is supported...
 * New login form,
 * New graphical layout (still needing improvments)
 * code factoring between webmail and quarantine plugins
 * etc.

static/stylesheets/basic.css

@@ -2,6 +2,7 @@ body {
     font-family: arial, helvetica, verdana, tahoma, sans-serif;
     font-size: small;
     background: #153F65;
+    margin: 0;
 }
 
 #first-container { 
@@ -342,3 +343,13 @@ body {
     margin: 20px;
     font-weight: bold;
 }
+
+/* nouveau style */
+#topmenubar { 
+    width: 100%;
+    margin: 0 auto;
+    padding: 0;
+    background: #072342;
+    border-bottom: 2px solid #333;
+    height: 30px;
+}