[SF#502437] rogue reactor and unittest in short, the nosy reactor was modifying the nosy list. That code had been there for a long time, and I suspect it was there because we weren't generating the nosy list correctly in other places of the code. We're now doing that, so the nosy-modifying code can go away from the nosy reactor.

recursive-include roundup *.py *.txt *.item *.index *.css *.filter *.newitem
recursive-include cgi-bin *.cgi
recursive-include test *.py *.txt
recursive-include doc *.html *.png *.txt
exclude doc/announcement.txt
include roundup-*
include *.txt