try to follow PEP8

- fixed most important code after checking with flake8
- ignored code which has to be reworked or removed
+ mark unused code with 'TODO: remove ...'

Change-Id: Ic45e541049e391e2853d29cd64bb0963bd9a2125
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/25053
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/gui/util.py

@@ -32,6 +32,7 @@ uipath = path.dirname(__file__)
 def loadUi(widget, uiname, subdir='ui'):
     uic.loadUi(path.join(uipath, subdir, uiname), widget)
 
+
 class Value:
     def __init__(self, value, timestamp=None, readerror=None):
         self.value = value