code: public Map<String, Job> getJobs(FolderJob folder) throws IOException {
          return getJobs(folder, null);
      }
docs: Get a list of all the defined jobs on the server (in the given folder)
  
  @param folder {@link FolderJob}
  @return list of defined jobs (summary level, for details @see Job#details
  @throws IOException in case of an error.