Add check of comparison filetype to allow detecting and reporting which filetype has diff.

        subprocess.run([isar_post_renderer_path] + isar_post_rend_opts.split()[1:], check = True)        

    diff_opts = replace_paths(diff_opts, testv_path, ref_path, cut_path)

    result = True

    diff_in_wav = False

    diff_in_met = False

    diff_in_csv = False

    for cmd in diff_opts.split(';'):

        result = result and filecmp.cmp(cmd.split()[1], cmd.split()[2])

    if not result:

        assert False, "Output differs" 

        if not filecmp.cmp(cmd.split()[1], cmd.split()[2]):

            if ".csv" in cmd.split()[1]:

                diff_in_csv = True

            elif ".met" in cmd.split()[1]:

                diff_in_met = True

            else:

                diff_in_wav = True

    if diff_in_wav or diff_in_csv or diff_in_met:

        result_str = "Output differs in: "

        if diff_in_wav:

            result_str = result_str + "waveform "

        if diff_in_met:

            result_str = result_str + "MASA metadata "

        if diff_in_csv:

            result_str = result_str + "object metadata "

        assert False, result_str