Merge branch 'belenos' into 'belenos'

Belenos

I realized that certain programs notifications (the "icons on the tray") didn't show up on the indicator applet. Then I decided to look why it worked on Trisquel 6 and I discovered that the notification area is not present on Trisquel 7. I don't know what happened but this should solve the problem. (I hope so, I tested it twice)

See merge request !110