anchor.diff:  
     // - - - - - - - - - - - - - - - - - - - - - - - -
   
  -  var forkFailedDialog = function(reason) {
  -    var message =
  +  const forkFailedDialog = (reason) => {
  +    const message =
         'Failed: On the originating server, ' + reason + ' does not exist';
       $('<div>')
       .html(message)
  
positive.code: 
    // - - - - - - - - - - - - - - - - - - - - - - - -
  
    var copyRevertFilesToCurrentFiles = function(visibleFiles) {
      var filename;
      for (filename in visibleFiles) {
        if (filename !== 'output') {
          cd.newFileContent(filename, visibleFiles[filename]);
  
negative.code:   // refresh [revert] (from dialog only)
    //-----------------------------------------
  
    const refreshRevertButton = () => {
      const button = $('#revert-button');
      cd.setTip(button, () => {
        const tip = 'revert to ' + param.avatar + ' '  + param.nowTag;
        cd.showHoverTip(button, tip);
      });
    };
  
    // - - - - - - - - - - - - - - - - - - - - - - - -
  
    const doRevert = () => {
      const revertParams = {
            id: param.id,
        avatar: param.avatar,
           tag: param.nowTag
      };
      $.getJSON('/reverter/revert', revertParams, (data) => {
        $('#review-dialog').dialog('close');
        deleteAllCurrentFiles();
        copyRevertFilesToCurrentFiles(data.visibleFiles);
  