mailchimp 6.x-2.3

This release is packed full of numerous critical bug fixes and other improvements. It also happens to be the first release since MailChimp began officially sponsoring the development and maintenance of this module through their integration fund.

• #940510: Dutch translation by henkit.
• #947906: Error on Mailchimp admin page
• #949932: Module gets newsletters from API, but no users are signed up when form is submitted
• #972856: Subscribing on one list unsubscribes from another. Solves the problem of multiple newsletter forms on the same page. Adds an implementation of hook_forms and some other improvements.
• Adds a collection of mailchimp lists to the registration form. These are required by the submit handler
• Move the signup process during registration into hook_user() to resolve various issues. Also reverts #939990: Array to string conversion & Undefined index Notices which was causing problems.
• #977190: Groups collapsed when "opt-out" option is selected on a list by jm.federico.
• #919492: Move 'Newsletter Subscriptions' user tab to top level by smoothify.
• Add automatic removal of users from lists they should not be in to cron processing and fix object errors in mailchimp_mailchimp_merge_values().
• Provide a mechanism to rebuild the MailChimp user table so that cron processing works correclty. Addresses #840996: Handle user updates for lists being set as compulsory.
• #965088: 'mailchimp_lists' variable is double-serialized? by DamienMcKenna.
• #987254: Unused code can cause problems
• Clean up unsubscribe callback, remove extraneous variables, and resolve #986268: Unsubscribing anonymous user not working.