Accuracy improvements and cleaning up

Made sure LEDs are on only when their location is accurate:
* do not switch LEDs on before one full round has been detected, to
know the globe speed
* switch all LEDs off once a round is finished until a new round is
detected, do not start the next round immediately

Cleaned up the indentation.
Added interesting examples

The previous example was displaying an empty globe.
Now there are two animated examples that should look good.