Drupal 6 port of phrase_captcha.module: moved admin stuff to word_list_captcha.admin.inc and general stuff to prase_captcha.inc

added font size option
sort of font select

added some font definitions
other minor changes (help string, settings validation, minor bugs)

Removed usage of array_combine (which is not available in PHP 4). see also http://drupal.org/node/171484#comment-296626

minor related changes

put captcha phrase in own form item (instead of prefix in 'captcha_response')

renamed "word list captcha" to "unrelated word captcha" which is more descriptive (preparation for merge of phrase_captcha.module and word_list_captcha.module)

added documentation
changed the default code length from 4 to 6
minor changes

refactored the CSS rule stuff for word list as form radios to text_captcha/text_captcha.css, for use in text_captcha/phrase_captcha/phrase_captcha.module and text_captcha/word_list_captcha/word_list_captcha.module

phrase captcha overhaul: changed from textfield to select form item, streamlined UI, added option for adding additional select options