validate captcha control
Created 2.8.x branch
Copyright notices now includes 2009
fixed an issue with text-captcha (default text got saved). Changes default text.
Added some missing add_slashes(), get_post_escaped(), and strip_tags() for $_POST, $_GET and $_REQUEST-data. Also for $_SERVER['PHP_SELF'].
captcha admin-tool: fixed display-issue with Firefox.
Text-captcha: moved text-file to database.
Security bugfix: Text file for text-captcha was readable from everywhere. Text-captcha: empty line in test file, following a question, was accepted as answer. Fixed.
Text-CAPTCHA: added description how to input questions and answers.
Added Text-CAPTCHA on request. The captcha-text will be stored in temp/.captcha_text.txt
Added new CAPTCHA (calc_ttf_image). Changed call_captcha() to output a table-layout. Some minor changes to captcha-code.
Added preview-images for CAPTCHA. Improved security: CAPTCHAS can't be loaded from outside WB
Added keywords to files where they are missing
added new CAPTCHA and ASP (Advanced Spam Protection)