Remove main functionality from scoring_alg_single_user and put in
abstract_alg. Add use of adj_means.mat.
- abstract_alg.m contains the former functionality of
  scoring_alg_single_user.
- adj_means.mat is a copy of the file from the model_weights folder.
- Remove commented out code from pred.m
- Add a 'subtitle' parameter to pred_grapher and add code to print the
  plots it produces.