{21} Tickets waiting for user feedback, by last modified date

This report displays the active tickets that have the "needinfo" keyword, ordered by last modified date.

This complements the {20} report, which doesn't contain the needinfo tickets anymore.

As a rule of thumb, unanswered tickets over 3 months old can be closed as worksforme or wontfix (see TracTicketTriage#StatusandResolution for the details).