Make command line tools to recommend diagnostics

[kazewong]

I think it would be beneficial to have a command line tool that performs the list of checks we usually do and flags warnings.

For example, throughout helping people with their problems, there are a number of checks one can usually do:

1. Is there nan in the log_prob?
2. Is the local/global sampler accepting too many or too few?
3. Is there a huge discrepancy in the log_prob?

These are essentially running the diagnostics suggested on the FAQ page, but I think it would be nice to have a button where the user can hit and get recommendation on what to do.