Better handling of multi-topic discussions

[ewinslow]

E.g. http://community.elgg.org/discussion/view/1588172/why-is-there-no-good-free-video-plugins-like-vlc-media-player-for-elgg-and-some-good-themes

This question brought up:

• video players
• themes
• elgg.org vs. elgg.com

IMO, it should have been broken down into two/three questions first before getting answered, but I don't have a good concrete suggestion for handling this case. Do we...

• Just close it and ask the OP to split it up?
• Have a button for moderators to split it up?