mailchimp 6.x-2.0

The following is a list of changes since RC5. For a complete change log, please refer to the previous release candidates.

• #824440: Minor schema error by petermallett
• Add proper individual block forms for authenticated users, plus a bunch of other refactoring. Addresses #829768: Blocks don't show authenticated user subscription options.
• Greatly improved handling of anonymous sign up forms. If more than one, presented in a combined form. Still available individually in blocks.
• Pulling settings into a separate admin.inc file
• #810616: Anonymous subscription form subscribes to wrong list when multiple lists are available