Function person_change 

pub(crate) fn person_change(
    key: &str,
    addresses: &str,
    verb: &str,
    value: &str,
) -> String

A change made on a person’s sheet (verb: “list”, value a list’s name or “” for their categories; “always”, value “on” or “off”). Blocked and Always through exclude each other (Q3): choosing one takes them off the other, said. Returns {sheet: the sheet again, line: what the status line says}.