captcha_pack 6.x-1.0-beta3

Changes since DRUPAL-6--1-0-BETA2:

• #431672: minor fix in random_captcha for compatibility with CAPTCHA 6.x-2.x branch (hook_captcha('generate', ...) also takes a third element)
• #393592 by iva2k and soxofaan: random_captcha_type ignored prerpocess phase
• removed unnecessary preprocess settings
• replaced lost_character preprocess stuff with standard FAPI #process callback
• dropped usage of preprocess in foo_captcha
• removed cruft
• replaced option for case insensitive validation for foo challenge with option for space insensitive validation
• removed preprocess stuff from random_captcha_type module
• #503104 by fractile81 and soxofaan: maxlength of Math response textfield was only based on result, but should also take x and y into account
• #503104: better calculation of math captcha response field maxlength
• #431672: fixed regression bug in revision 1.14 of random_captcha_type.module