Merge branch 'master' into develop

docs/graph2d/index.html

@@ -383,8 +383,8 @@ groups.add({
         <tr>
             <td>visible</td>
             <td>Boolean</td>
-            <td>true</td>
-            <td>This field is optional. If false, this group will not be drawn.
+            <td>no</td>
+            <td>This field is optional. If false, this group will not be drawn. By default it is true.
         </tr>
     </table>
 
@@ -1492,4 +1492,4 @@ var options = {
 <script src="../js/tipuesearch.config.js"></script>
 <script src="../js/tipuesearch.js"></script>
 <!-- controller -->
-<script src="../js/main.js"></script>
+<script src="../js/main.js"></script>