Minor cleanups

Signed-off-by: parhamfh <parhamfh@kth.se>
new nonandom ways of determining probabilities

For the rhythm model

Signed-off-by: parhamfh <parhamfh@kth.se>
Using new method with a probability peak invented by moi

Signed-off-by: parhamfh <parhamfh@kth.se>
Refactored/Renamed Ponder into new Formatter module

It is now called LilypondFormatter and also under the formatter module the
module for outputting data in Orpheus' format will be available.