Issue: Article Browsers Query Inefficient

While this issue also needs to be addressed in default vBulletin, the users browsing box below each article uses a query that returns EVERY online user. The PHP must then analyze each user individually, wasting CPU cycles, when we could easily just filter the users via the query.

Fixed for the next build. True optimization is pending vBulletin's improvement of the database by adding indexes to lastactivity, inforum, and inthread on the session table.