Capture warnings/errors from `info_snippet()` fns

When building up table information through an informant, you can specify functions to invoke at incorporate() time. This is great because you can glean info from a changing-over-time table and put those results into the info text. However, what if one or more of those functions fails?

We don’t want to stop the process entirely but we do want to report on these evaluation problems so that they can be fixed by the user. Fortunately, this is a solved problem in the data validation workflow. We use an internal function to evaluate certain functions and capture any error/warnings. So, this methodology needs to be brought over to the information management workflow.