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- Validation of human (CAPTCHA). - self creation of account (e-mail address as username). - choice of CAPTCHA: original (Authen::CAPTCHA) or newer reCAPTCHA (requires) DC to create account with http://www.google.com/recaptcha/, or not used. - Routines to generate CAPTCHA input and validate response moved to loncommon.pm to facilitate re-use. - Domain configuration for self-creation of accounts allows DC to choose which CAPTCHA option to use. - CPAN module: Captcha::reCAPTCHA now needed. rpm being added to msu/testing repos, and dependency included in LONCAPA-prerequisites 1-21.