feature #378, bug fixed on draw() call

The oTable javascript variable is built with jQuery('#userList').dataTable(),
which returns a jQuery object, while jQuery(...).Datatable() would directly
return a DataTables API object. So now, to access the draw() function, we need
to get the api() first from the jQuery object.

https://datatables.net/manual/api#Accessing-the-API

admin/themes/default/template/user_list.tpl

@@ -93,7 +93,7 @@ jQuery(document).ready(function() {
         jQuery("#addUserForm .loading").show();
       },
       success:function(data) {
-        oTable.draw();
+        oTable.api().draw();
         jQuery("#addUserForm .loading").hide();
 
         var data = jQuery.parseJSON(data);
@@ -584,7 +584,7 @@ jQuery(document).on('click', '.close-user-details',  function(e) {
       title:"{/literal}{'Edit user'|translate}{literal}",
       href:".user_form_popin",
       onClosed: function() {
-        oTable.draw();
+        oTable.api().draw();
       }
     });
 
@@ -825,7 +825,7 @@ jQuery(document).on('click', '.close-user-details',  function(e) {
         jQuery("#applyActionLoading").show();
       },
       success:function(data) {
-        oTable.draw();
+        oTable.api().draw();
         jQuery("#applyActionLoading").hide();
         jQuery("#applyActionBlock .infos").show();