CaptchaPlugin enhancement and behavioural change

[Alec Thomas]

<cmlenz> so ideally the captcha would kick in on the settings page, or if the user has no session, on the individual submission pages

<athomas> hmmm, i could probably have the captcha page POST to the original URL, with all the args as hidden form variables

<cboos> (about the POST issues: that's why I think that a simple workflow like: submit -> rejected as spam -> "please go identify yourself" -> settings +captcha, would perhaps be the cleanest solution for now)

(CaptchaPlugin could be integrated into SpamFilterPlugin as an extra verification phase?)