TODO
  - selection of language from set of files in ./languages/
  - moving xearth into a shared library instead of background shell call.
  - setting time & date properties of the system.

  - when clicking on a continent/city pair, the apropriate timezone
    should be displayed on the globe.
  - rotation of the globe, if user drags it.
 

If you think of anything that should be here, please contact the
author Beat Christen at beat@longstreet.ch