gps backend issues

[Jussi Kukkonen]

Ok, I've uploaded the changes under discussion here.

* libgpsbt is now an optional dependency

* backend sets a gpsd callback on startup. This callback emits a
  geoclue_position_current_position_changed signal. Unfortunately the
  gpsd callback system doesn't carry any "clientdata" with it -- I had
  to make the GeocluePosition object a global variable. Better solutions
  are welcome.

* current_position does not query gpsd at all, it just reads the data
  structure gpsdata (which gets updated because of the callback).
  This is fast and af far as I can see pretty safe: I do check that
  the gps is online and has a fix...

-jussi


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