Migrate workflow content view template to jsf2

Since 6.0, Worklow tab is hidden by default and we don't use this feature by default.

As a result, we did not figure out that a couple of associated xhtml templates were not correctly migrated on jsf2.

Main issue is on workflow_content_view.xhtml actions.

task_action used to be ajax but not anymore, as a result we have errors due to mixed ajax and non-ajax requests caused by:

 onclick="jQuery.fancybox.close()"

.

A possible solution for this issue is to make the actions non-ajax and remove the close of the fancybox.

Another issue is that, required fields from the layout introduced by:

                          <nxl:layout name="#{action.properties.layout}"
                            mode="edit"
                            value="#{action.properties.formVariables}"/>

are actually not required.

Other issue

Task displayed in workflow_content_view.xhtml includes cancelled tasks.