Read log files generated by users

Let the program reads file generated by rt2ms, logpeek, or itself.

#94 (closed)

sohstationviewer/model/reftek_data/reftek.py

@@ -5,12 +5,10 @@ from pathlib import Path
 from typing import Union, List, Tuple, Dict
 import traceback
 import numpy as np
-from obspy import UTCDateTime
 from obspy.core import Stream
 
 from sohstationviewer.conf import constants
-from sohstationviewer.model.reftek_data.reftek_reader.log_file_reader import \
-    (
+from sohstationviewer.model.reftek_data.reftek_reader.log_file_reader import (
     LogFileReader, process_mass_poss_line,
 )
 from sohstationviewer.view.util.enums import LogType