[Unity] Add icon to show desktop in launcher

Unity does not bring in Ubuntu 11.04 An applet to show the desktop in the launcher, if instead a keyboard shortcut to quickly access the desktop is the key combination Super+D.

But you may be accustomed to go to your desktop by clicking on an icon, so in WebUpd8 have made a small script that does the same job as the show desktop applet for gnome.

First installed wmctrl in a