Deletion of PunBB (2nd nomination)

Comment: on the basis from the first reference found above, several mentions in books that call the subject one of the "most popular" forum implementation tools, and the reference found by Hobit, which I will |assume good faith on because I can't access it myself.  I would have liked to have seen a little more |in-depth coverage of it, though.  Many books only give it a passing mention
Stance: keep
Cited policy: Wikipedia:Assume good faith (WP:AGF||WP:INDEPTH)