Window Opacifier
cruft fixup
Added richardgv's improvments:
+invert mouse-selected window (+default behavior)
+help output (on misuse)
Added improvments similar to match style of inverter.sh:
+help output
Verify Compton (--dbus)
Intended as a header for future compton dbus scripts
+verifies that compton is running with dbus enabled on a display
+sets up a shortcut to call compton dbus
Added comment for sed section