Provide a mechanism to rebuild the MailChimp user table so that cron processing works correclty. Addresses #840996.

Add automatic removal of users from lists they should not be in to cron processing and fix object errors in mailchimp_mailchimp_merge_values().

Move the signup process during registration into hook_user() to resolve various issues. Also reverts #939990 which was causing problems.

Adds a collection of mailchimp lists to the registration form. These are required by the submit handler

#972856: Solves the problem of multiple newsletter forms on the same page. Adds an implementation of hook_forms and some other improvements.