Updated precisioner; dups ignore stopwords.

Precisioner has improved interface. Used to identify that duplicate
removal improves precision by 2.2% on average and 1.75% median. For
94.8% of the food count files analyzed there was an improvement. The
largest degradation was a precision drop of 1.3%.
Precisioner has blindness for annotator.

Mark randomized set of unique terms in sets of files. Fix deduping.