Bug#264774: RFP+confirmed

[Justin Pryzby <justinpryzby@users.sourceforge.net>]

I recommend the confirmed tag for aging RFPs.  RfPs which are
confirmed but have seen no activity in 60 days should become
'unconfirmed' and unconfirmed RfPs younger than 120 days should
generate some noise.  Maybe they are present on DWN or maybe
devscripts wnpp-alert will email people.  Then, there's an easy way to
confirm (bts program will work fine, but we should provide a non-DD
way too, like a web page button).  That confirms interest in the RfP
and updates its timestamp (I guess).

Justin