CaptchaChannel template : Ensures the user has enough human privileges by review of the CaptchaSecurityContext and using an abstract routine isContextValidConcerningHumanity(CaptchaSecurityContext) (implemented by sub classes)

The component uses 2 main parameters for its configuration :

• a keyword to be mapped to urls in the ChannelProcessingFilter configuration
  default value provided by sub classes.
• and a thresold : used by the routine isContextValidConcerningHumanity(CaptchaSecurityContext) to evaluate whether the CaptchaSecurityContext is valid default value = 0