Fix bug Event DS not plotted

closes #111 (closed), #105 (closed)

• If any of waveform channels are set, Event DS will be plotted
• TPS or RAW are plotted if one of TPS/RAW are checked
• Suggestion in #105 (closed) should be canceled because of the selection for Event DS

Notice: some info in Event DS lines are different in compare with logpeek Ex RT130-sample. Look at the end of SOH messages for Events: In SOHView:

DAS: 92EB EV: 0009 DS: 1 FST = 2017:150:00:00:00:15000 TT = 2017:150:00:00:00:000 NS: 432000 SPS: 40.0 ETO: 0
DAS: 92EB EV: 0012 DS: 1 FST = 2017:150:01:00:00:15000 TT = 2017:150:01:00:00:000 NS: 432000 SPS: 40.0 ETO: 0

In logpeek:

DAS: 92EB  EV: 0009  DS: 1  FST = 2017:150:00:00:00:015  TT = 2017:150:00:00:00:000  NS: -1  SPS: 40  ETO: ? ET
DAS: 92EB  EV: 0018  DS: 1  FST = 2017:150:01:00:00:015  TT = 2017:150:01:00:00:000  NS: -1  SPS: 40  ETO: ? ET

This will need be considered when reading RT130 directly.

sohstationviewer/model/reftek/reftek.py

@@ -196,7 +196,6 @@ class RT130(DataTypeModel):
         self.populate_cur_key_for_all_data(cur_key)
         if data_stream != 9:
             # don't get event info for mass position
-            self.populate_data_stream(cur_key, str(data_stream))
             self.get_ehet_in_log_data(rt130, cur_key)
         self.get_mass_pos_data_and_waveform_data(rt130, data_stream, cur_key)