[GUI change] Show users viewing thread.

[Dynamics]

@Blahs
It isn't hard to implement at all. This board is based on a vBulletin template, and it's one of the customizing options.

@Navman
There are a lot of things that seem pointless in forums, if you stripped a forum down to its bare essentials it'd probably lose it's flavour. I want this implemented because I personally would like to know this sort of thing. I like an informative forum, so I've proposed this change.

Thanks for the input about the topic so far.

Edit: Really confused about the ratio of thumbs up and comments lol. It's funny how people thumb up "yes, and I've explained why" when they omit their comments or feelings from the thread.