code: def filelist(jottapath, JFS):
      
      log.debug("filelist %r", jottapath)
      try:
          jf = JFS.getObject(jottapath)
      except JFSNotFoundError:
          return set() # folder does not exist, so pretend it is an empty folder
      if not isinstance(jf, JFSFolder):
          return False
      return set([f.name for f in jf.files() if not f.is_deleted()])
docs: Get a set() of files from a jottapath (a folder)