Find explicit way to expose Params subclass parameters to the user when constructing an instance of the subclass

[schuylerfried]

• Right now, if you construct an instance of a Params subclass, you either need to manually create an __init__ function to override the BaseClass init to explicitly show what the subclass attributes are. Or, you need to read the source code.

• Neither of these is ideal for people scripting in Ipython or using a jupyter notebook.

• Possible avenues:

1. Override the help on a class somehow, such that it prints all the attributes.
2. Autogenerate an __init__ function through a decorator on the Params subclass