code: function open(file) {
    if (!file) {
      console.log('No output file, force logging to console')
      config.logToConsole = true
      return
    }
    if (fs.existsSync(file)) {
      var suffix = (new Date()).toJSON()//(new Date()).getTime()
      var newfile = file+'.'+suffix
      console.log('Move datafile to', newfile)
      fs.renameSync(file, newfile)
    }
    dataFile = new DataFile(file)
  }
docs: client ] local open datafile [