simplenews 6.x-1.0-beta1

Major changes:
* Drupal 6 core compatibility
* CCK comptibility
* Any node type can be a newsletter
* Actions and triggers integration
* New mail backend
* Multilingual support
* Views integration

Minor changes:
* Multiple newsletter subscription block can now be uses one page.
* Option to update subscription when account is deleted/(un)blocked (#218979)
* theme_preprocess_HOOK() applied to theming functions.
* simplenews_HOOK.tpl.php files added.
* Mail back-end options:
- New 'Use cron' option
- 'Initial send time' removed
- Email debug option
* In-page links filtered out of email
* code style clean-up and doxygen comment
* simplenews_action as integrated module
* prettier confirm/remove pages and textual changes 'subscription list' to 'mailing list' (#109259)
* SMTP headers 'Precedence' and 'List-Unsubscribe' added (#248602)
* usleep() delay between mails sent removed (#247608)
* Node revision of send newsletter stored (#243522)

Other fixes:
* simplenews_time() removed
* simplenews_handle_messages() removed
* Menu entry admin/content/newsletters/users/delete removed
* simplenews_admin_users_delete() removed

Credits:
* Thanks for testing 6.x-1.x-dev, bug reports and feature requests:
Jorrit, CNlQ8o, julienbras, onglipo, yakaledo
*Code by Sutharsan