Remove nm hack

Updated gsettings
Added script to restart network-manager after suspend/hibernate
Updated gsettings for Belenos background
Hide ibus icon in gsettings
Disable switch user entry in gnome menu
disable trisquel-wm-chooser
Added mouse-button-modifier to gsettings
Removed computer-icon-visible from gsettings
Enable buttons in menus and buttons
Updated gsettings
Removed gnome-panel wrapper
Run nm-applet in gnome-panel wrapper script
Launch gnome-panel in the background