Richer output for hasConverged in quad

[mmahsereci]

Is your feature request related to a problem? Please describe. The hasConverged output in quad could be much more informative. At present it essentially indicates that the algorithm terminated without error. It would be better if more detailed diagnostic information were returned, e.g. exactly which element of a compound stopping criterion was triggered.

Give an example use case. Describe a use case for the feature or give a code snippet.

Describe the solution you'd like. A clear and concise description of what you want to happen.

Additional context

opening issue for @sullivantj