Add global Gantt chart for all projects

app/Template/project/index.php

@@ -6,7 +6,8 @@
             <?php endif ?>
             <li><i class="fa fa-lock fa-fw"></i><?= $this->url->link(t('New private project'), 'project', 'create', array('private' => 1)) ?></li>
             <?php if ($this->user->isProjectAdmin() || $this->user->isAdmin()): ?>
-                <li><i class="fa fa-users fa-fw"></i><?= $this->url->link(t('Users overview'), 'projectuser', 'managers') ?></li>
+                <li><i class="fa fa-user fa-fw"></i><?= $this->url->link(t('Users overview'), 'projectuser', 'managers') ?></li>
+                <li><i class="fa fa-sliders fa-fw"></i><?= $this->url->link(t('Projects Gantt chart'), 'gantt', 'projects') ?></li>
             <?php endif ?>
         </ul>
     </div>

app/Template/project/show.php

@@ -20,6 +20,14 @@
         <li><?= dt('Last modified on %B %e, %Y at %k:%M %p', $project['last_modified']) ?></li>
     <?php endif ?>
 
+    <?php if ($project['start_date']): ?>
+        <li><?= t('Start date: %s', $project['start_date']) ?></li>
+    <?php endif ?>
+
+    <?php if ($project['end_date']): ?>
+        <li><?= t('End date: %s', $project['end_date']) ?></li>
+    <?php endif ?>
+
     <?php if ($stats['nb_tasks'] > 0): ?>
 
         <?php if ($stats['nb_active_tasks'] > 0): ?>