Change "Repair/Remove" to "Agree/Disagree"

This changes the default binary question choices from "Repair" and "Remove" to "Agree" and "Disagree".

There could be further improvement — for example, renaming binary questions from "numerical_response" to something like "binary_question" — but this is a useful and necessary immediate change for anyone redeploying.

Also, could still debate whether this should be "Yes"/"No" but going with this for now. cc #197.