Merge changes I02169a8a,I23fa3680,Iee2355e0,Iae35113f

* changes:
  Restore original x axis direction for tradeoff plot
  Plot also Sensitivity, Balanced Accuracy and use ggplot
  Fscore over the full range
  added Fscore plot for various cutoffs
tree: fdc07a1e3f1f9a38e1d9beb04ab4b5c6c2f76b31
  1. data/
  2. R/
  3. idioms.Rproj
  4. readme.txt