- add a new pattern to the logger.conf file (and a fallback
   one hardcoded to FIJITestsViewer)
 - parse the config file within FIJITestsViewer and change the layout
   pattern of the QueueAppender accordingly
 - make sure the download worker uses the same logger configuration
   as the main thread by re-applying the same changes in the worker thread
 - also, add indentation to ordinary multi-line log messages