Display of available command line parameters

[brettin]

The suggestion is to allow the developer to "mask" what command line parameters are displayed when a user uses the --help option. Many of the default command line parameters are not used in a DNN.

[jmohdyusof]

This is definitely a good idea. However, the default model file and/or ‘required’ elements in the code are not the complete list of options, so this somehow needs to introspect the functions actually being used to some extent to enable the full list of options. Otherwise, we need to perhaps mandate a list of valid parameters somewhere in the code?