Updating form description text to match new settings.
Coherent defaults and error reporting in hook_update_N functions.
misc coding style
Updating mc_lists_user_subscribe_page to display required list interest group settings, if configured.
Refactoring mc_lists_load_multiple to require all 'conditions' passed, not just any condition; and to return only a single instance of each list.
Configuring block_view for subscriptions to intelligently display required lists when needed.