Wrap config.py config.config_dict in a class so values don't change

[tnigon]

The config_dict changes when used over and over (passed to various class instances - FeatureSelection, Training, etc.), and when the variables are used, they are being modified in the original file. I try to use dict.copy() anytime it's used, but this is a soft copy and modifies the config.

copy.deepcopy() works, but requires that another library is imported.

To do

Decide whether to go forward with deepcopy or to encapsulate config_dict (and perhaps other settings) in a class.