subscriptions 6.x-1.0-beta6

This is the sixth BETA version of the Drupal 6 port of Subscriptions 5.x-2.x.

We do not recommend installing it on a production site, but we encourage you to test it and provide feedback (both good and bad!) in the issues queue. See #273505-20: Subscriptions for D6 is released! for details.

Changes since BETA5:

- #367093: Don't suppress "On comments" checkboxes.
- #259377: French translation.
- #500148: Mention 'comment' in the node-nid template description; also change 'Pages' to 'Pages/Threads'; update .pot and de.po.
- #524362: Fix empty subscriptions_content_node_form().
- Fix the fix: MySQL doesn't like CAST(... AS VARCHAR).
- #524332: PostgreSQL fixes.
- #524332-5: Undo the taxa optimization; it destroys potentially useful data and is non-conformant SQL.
- #507898: Avoid creating duplicate entries in {subscriptions_queue} for new comments.
- #507898: Avoid creating duplicate taxa entries in {subscriptions_queue}.
- Add img_assist module support (provide URLs of embedded pictures).
- Add the !files variable to list attached files.
- Define new hook_subscriptions_ui() to allow arbitration of multiple node UIs.
- #301229: Remove subscriptions_moderate_content_notifications module.
- Update strings, .pot file and German translation.
- #430870: Check the syntax of the blocked node input field.
- #324716: Allow modifying the "From" e-mail name.
- #427642: Add Hungarian translation.
- Minor clean-up (mostly strings).
- #356964: Add "Latest activity, authored, commented" information on the page/thread subscriptions page.
- #356964: Add select/unselect all checkbox on the subscriptions pages.
- #373130: Avoid mentioning 'red' formatting because this is theme-dependent.
- #372490: Add tag symbol to links that are visible only due to the 'subscribe to all content types' permission.
- #373128: Fix notice (Trying to get property of non-object).
- #371701: Add another pgsql CAST().
- #365682: Commit Brazilian Portuguese translation.
- #362533: Analyze and report faulty returns from hook_subscriptions().
- Move Danish translation to the correct directory (it's based on the D5 version even though it was uploaded to HEAD/D6, but it's better than nothing).
- #351753: Add any missing {subscriptions_user} records without complaint to support multi-site installations.
- Remove pre-D6 {subscriptions_mail_edit} table from database schema.
- Clean up database schema to keep schema module happy.
- #305235: Revert previous patch because it didn't work.