code cleanup and comments

csv_threading.py

@@ -1,13 +1,14 @@
 # tThis file contains code for executing a sequence of magnetic fields from a csv file.
 # To do this without crashing the UI it has to run in a separate thread using the threading module.
 
+# import packages:
 import time
 import pandas
 from threading import *
 from tkinter import messagebox
-
 import matplotlib.pyplot as plt
 
+# import other project files:
 import User_Interface as ui
 import cage_func as func
 import globals as g