organizing imports
replace deprecated methods with new ones #2176
Last updates for natural language generation (added comments, new options, cleaned the code, etc)
Improved the function buildFeature and fixed conditions never entered (causing upper and lower boundaries to be never printed).
Updates to add a new output as a String.
A few improvements, and code cleaning
Added comments, cleaned a bit the code, corrected a bug that occurred when the unit was null
New classes for Natural language generation