Potential tolerance issues w/ AD

[agerlach]

When performing AD the the magnitudes may be drastically different than the original observable of interest. Thus, the quadrature tolerances required may be quite different. I don't think there is a good way to hide this fact from the user. Need to brainstorm ideas. At a minimum we need to update the docs to reflect this.

[ChrisRackauckas]

The quadrature has a relative tolerance. Wouldn't this handle it?