refactored computeCompactness, changes in config

- computeCompactness is refactored, added docstrings
- added command line argument to em_bright_categorize
  to accept EoS as a command line argument
- changed training script to use KNeighborClassifier
  in place of RandomForestClassifier
- modified the configuration file to create and run DAG
- minor changes to DAG em_bright_dag_writer to give
  parameter sweep plots