Rework key bindings that conflict with the new function key workspaces
Rework key bindings that conflict with the new function key workspaces

<Super+Shift+F4> was previously used to hibernate; that function is also
served by <Fn+F12>, so it is redundant and has been removed.

<Super+F12> was used to toggle the touchpad on and off; that function
has been rebound to <Super+->.

tmhedberg/xmonad.hs