[Catalyst] Wiki spam

[Wade.Stuart at fallon.com]

>
> Seriously, I'm a card carrying member of the web standards nazi club
> most times, but how many site impaired people are using the catalyst
> wiki again?
>

Also this only blocks posting not reading.  We can also have a non captcha
version that is not linked to with a hard to guess name and a line that
says:

"This posting page requires the use of a captcha verification system.  If
you are not able to use this system
because of a vision disability please email poor_sob_wiki_admin at ... for a
special way to post to this wiki."

-Wade