- "match" for the nilsimsa difference between hex digests was the wrong word.  Changed to difference.
- I want each difference to be a score out of 100 rather than 128 - threshold and I wanted closer matches to score much higher than ones that just crossed the threshold.  For example, a nilsimsa difference of 128 (which mean exactly the same) scores 100 whereas the score for a nilsima difference equal to the threshold will be 0.