Releases for Checkout (content locking)

New features:
- Refactored large parts of the code.
- Moved node locking to an earlier stage to more reliably detect node edit urls
and avoid unnecessary locking. This also allows user defined urls to lock
nodes for (no UI yet).
- by ptalindstrom: Display error message even when the same user tries to edit
its own locked node.
- by Frank Steiner: (Backport) Trying to regain lock when a lock has been
removed.

Bugs fixed:
- #245685: Fixed endless page redirect if $base_url is set (ie. Drual is
installed in a subdirectory).
- Fixed node (un)locking, especially when using url aliases.

Changes since DRUPAL-6--2-1:

• Fixed node re-locking.

Changes since DRUPAL-6--2-0:

• #281584: Fixed editing locks not being released when navigating to a non-node url.
• #245685: Fixed endless page redirect if $base_url is set (ie. Drual is installed in a subdirectory).
• Fixed users being able to release arbitrary locks.

New features:
- #250834 by Frank Steiner: Ported to D6.
- Refactored large parts of the code.
- Moved node locking to an earlier stage to more reliably detect node edit urls and avoid unnecessary locking. This also allows user defined urls to lock nodes for (no UI yet).
- by ptalindstrom: Display error message even when the same user tries to edit its own locked node.

Bugs fixed:
- Fixed node (un)locking, especially when using url aliases.

New features:
- Moved the option to keep documents checked out to the access permissions table.
- Moved the only remaining setting to the Post settings page (admin/content/node).
- Users with the 'administer checked out documents' permission are now given the option to immediately check-in a locked document through a link in the error message.
- Added support for PostgreSQL.

Bugs fixed:
- Stopped cron from spamming watchdog when there actually were no documents checked out.

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