Transition:
* R raises an integer casting error if the --ddgram flag is specified

Feature aggregation:
* Update interface to use new load_features array-based structure
* Improve speed (should be easy)
* Make significance calculations statically sound

Signal distribution:
* Improve speed
* Re-enable signal distribution plot
* Try Q-Q plot in each cell


Overall:

* Improve documentation
* Add ability to analyze multiple segmentations at once => run it on the cluster