Add Client Version column to Sessions page

As version is already available in session details it could be useful to also have a column showing it in the Sessions list. Ideally it would also show the client name. But lets say in Spark example client name has not just Spark, but also Smack version in parenthesis. Which is too much. Unless that column could parse the name, or maybe Openfire should parse Spark name better (or maybe Spark should report it better). Otherwise maybe just showing a version will suffice.