Highlight whats left undone in a form

[mcnuttandrew]

Sometime in a form with a lot of components (think like a demographic survey or long sus or something) it can be easy to miss a specific questions. This then may prevent you from advancing in the study (if the study requires all of the parts to be answered). It would be cool if revisit could provide some hints about what isn't answer yet (such as highlighted backgrounds for the component) or put big arrows or something.