rebase codebase, delete trunk, move threads to backend

src/ui/widgets/graph.py

@@ -1,4 +1,3 @@
-
 import random
 from typing import Union
 
@@ -124,7 +123,7 @@ class DataGraph(QtWidgets.QWidget):
         years.sort()
         for year in years:
             SoSe_year = f"SoSe{year}"
-            WiSe_year = f"WiSe{year}/{year+1}"
+            WiSe_year = f"WiSe{year}/{year + 1}"
             if SoSe_year not in SoSe_data.keys():
                 SoSe_data[SoSe_year] = 0
             if WiSe_year not in WiSe_data.keys():