New User Flood

There seems to be a flood of new users, I can only guess that these are not people interested in robocode, but rather some kind of spam bot (or spam bots). We need some way to captcha user creation I think.

While we are at it, remove some of those "new users" without any edits.

I wonder why create spam bots when you can create Robocode bots. :P

Speaking of user removal. How many active admins do we have?

Well a few, for example I don't have access to actual site stuff (so I can't add a captcha).

We could just go through and manually delete them all, but there is no bulk method way to do that (that I know of).