The KB list search matched only shortdescription + keywords, so searching a
topic (e.g. "Spotfire", the Application name) surfaced just the one article
whose title/keywords contained the word, not the others tied to it by topic.
Match the topic too via an appid IN (apps named like the term) subquery - used
instead of a join so it does not collide with the sort=topic join, and articles
with no app still match on title/keywords.
8dce622392