More Test and Flake8 Cleanup

- Allow flake8 to check more files as well.

core/tests/base.py

@@ -147,6 +147,8 @@ def GetTestGroups():
 
 
 class TestApp(TestAppBase):
+    __test__ = False
+
     def __init__(self):
         def link_gui(gui):
             gui.view = self.make_logger()