subscriptions 6.x-1.2

This is version 1.2 of Subscriptions for Drupal 6.

Changes since 1.1:
Enhancements:
- Some minor code tuning.
- #648600: Create new subscriptions_digest_alter().
- #401298: Provide !revision_name and !revision_log variables.
- #581042: Implement a pager query for user/UID/subscriptions/node.
- #590022: Reduce the footprint of subscriptions_mail.
Bugs fixed:
- Fix some strings.
- #611850: Really keep users from getting notifications from blocked content types.
- #591470: Avoid iterating over all thread subscriptions when preparing the node subscribe form.
- Tune a string.
- #590738: Ensure that subscriptions_update_6101() runs successfully and remove the obsolete {subscriptions_user}.last_sent column.