quitButtonF :: F Click b
quitButtonF is a quit button, i.e., a command button that, when pressed,
terminates the program.
Keyboard shortcut: <Mod1>q
Layout: quitButtonF places itself as far down and to the right as
possible, if there is spare room.
quitButtonF
The window manager usually provides a quit button in the window frame, or something equivalent, so there usually is no need to put an extra quit button in the program.
