Add a hidden “honeypot” field to comment forms, to help combat comment spam.

Mark Howells-Mead

Adds a hidden field to comment forms, which will subsequently be auto-filled by spam-submitting robots. If the form 
submission contains a value, the comment will not be saved, because only robots will see the field and fill it out.
Simple!
Any form which is processed using the hook <code>comment_form_after_fields</code> (building the form HTML) and <code>preprocess_comment</code> 
(for processing the form submission) will be extended with this functionality.
This plugin doesn’t block or catch any form submissions which have been filled manually in a browser, so you may still 
receive the occasional advertising or sales message as a post or page comment. However, blocking automatically-generated 
spam messages will reduce the number of unwanted messages greatly.

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