[boost] Report # 29 (aka 1.45 blockers) is too narrow

I think that boost report # 29 (https://svn.boost.org/trac/boost/report/29) is too narrow a query. If you remove the "Milestone" filter you get nearly fifty tickets marked Showstopper, going back 22 months. A ticket's originator may not know what milestone to fill in, and his/her ticket shouldn't be lost because of that. I think they all need review.