Closing the ground system should close all of its windows

[astrogeco]

Describe the bug
If other ground system windows are open, clicking "close" on the main GroundSystem window only stops the process and closes tha main window. All the other windows stay on the main screen

Using ctrl-c on the main terminal running the ground system also leaves the windows up

To Reproduce
(1) Open the ground system and a couple of windows, click "close" on the original GrounSystem menu.

(2) Open the ground system and a couple of windows, use ctrl-c and stop the python process.

Expected behavior
All windows close when exiting the ground system

Code snips
None

System observed on:
Gnome VM

Additional context
None

Reporter Info
Gerardo E. Cruz-Ortiz, NASA-GSFC

[zachar1a]

Using ctrl + c doesn't call the closeEvent function and I haven't been successful in creating a handler that does. But when used with os.kill(0, signal.SIGKILL) the closeEvent can shutdown all of the subprocesses.