Add "delete mode" on history table allows individual rows to be deleted permanently.

Add user history purge option in edit user screen. Will remove all history for selected user.

data/interfaces/default/sync.html

@@ -58,7 +58,7 @@
         }
         sync_table = $('#sync_table').DataTable(sync_table_options);
 
-        var colvis = new $.fn.dataTable.ColVis( sync_table, { buttonText: 'Select columns', buttonClass: 'btn btn-dark' } );
+        var colvis = new $.fn.dataTable.ColVis( sync_table, { buttonText: '<i class="fa fa-columns"> Select columns</i>', buttonClass: 'btn btn-dark' } );
         $( colvis.button() ).appendTo('div.colvis-button-bar');
     });
 </script>