Add RT130 experiment number to file info widget

Closes #72 (closed)

sohstationviewer/view/file_information/get_file_information.py

 from typing import Union, Dict, List, Set, Tuple
 
-from PySide2.QtWidgets import QTextBrowser
-
 from sohstationviewer.controller.plotting_data import format_time
 from sohstationviewer.model.data_type_model import DataTypeModel
 from sohstationviewer.model.mseed.mseed import MSeed
@@ -9,8 +7,7 @@ from sohstationviewer.model.reftek.reftek import RT130
 from sohstationviewer.view.util.functions import extract_netcodes
 
 
-def extract_data_set_info(tracking_box: QTextBrowser,
-                          data_obj: Union[DataTypeModel, RT130, MSeed],
+def extract_data_set_info(data_obj: Union[DataTypeModel, RT130, MSeed],
                           date_format: str
                           ) -> Dict[str, Union[str, List[str]]]:
     """
@@ -19,12 +16,12 @@ def extract_data_set_info(tracking_box: QTextBrowser,
         - Start / end times
         - Station ID
         - DAS Serial Number
+        - Experiment number
         - Network Code
         - Tag number
         - GPS information
         - Software version
 
-    :param tracking_box: widget to display tracking info on
     :param data_obj: the data object to extract file information from
     :param date_format: the format by which to format file's start/end times
     :return: a dictionary containing the information of a file
@@ -50,12 +47,18 @@ def extract_data_set_info(tracking_box: QTextBrowser,
 
     if data_type == 'RT130':
         das_serials = list({key[0] for key in data_obj.keys})
-        data_set_info['DAS Serial Numbers'] = ','.join(das_serials)
-        if len(das_serials) > 1:
+        experiment_numbers = list({str(key[1]) for key in data_obj.keys})
+        # The insertion order into data_set_info in this piece of code is
+        # important, so we had to write it in a way that is a bit repetitive.
+        data_set_info['DAS Serial Numbers'] = ',  '.join(das_serials)
+        if len(data_obj.keys) > 1:
             data_set_info['Selected DAS'] = data_obj.selected_key[0]
+        data_set_info['Experiment Numbers'] = ',  '.join(experiment_numbers)
+        if len(data_obj.keys) > 1:
+            data_set_info['Selected Experiment'] = data_obj.selected_key[1]
     else:
         stations = list(data_obj.sta_ids)
-        data_set_info['Station IDs'] = ','.join(stations)
+        data_set_info['Station IDs'] = ',  '.join(stations)
         if len(stations) > 1:
             data_set_info['Selected Station'] = data_obj.selected_key
         data_set_info['Network Codes'] = extract_netcodes(data_obj)