Many bug fixes, save_dir stuff still unresolved

datacontainer.py:
-added needed import calls
-tried to parametrize self.save_dir from config file, can’t figure out
why commented code breaks things when uncommented

enrich.py
-fixed EnrichError import
-fixed syntax error in plots argument
-commented out the call to global() because it doesn’t work and I can’t
figure it out
-added save_data() parameter

experiment.py
-added import DataContainer
-added needed parameter for DataContainer call
-added need parameter for save_data() call (assumes DataContainer will
have self.save_dir)

selection.py
-added import DataContainer