Releases for Private Upload

http://drupal.org/node/285709

* http://drupal.org/node/283982: Fixed error on edit.
* http://drupal.org/node/281821: Fixed warning on save.

Unfortunately, the first RC is bad. When I forked the DRUPAL-5 and DRUPAL-6--1 branches, I think I accidentally reverted. Anyway, RC2 should be good to go.

* Fixed issue with attaching to node on creation.
* Fixed issue with preview dropping private value.

Mostly a by-the-book port of 5.x-1.0-RC.
I Needed to added hook_file_download to replace the node-level access control that was removed in Drupal 6 core. Since a file can now be attached to multiple nodes, a user can now see a file if, and only if, they have access to view at least one of the nodes the file is attached to.
Also, I removed the obsolete migration code.

Starting the Drupal 6 port

Rolling in contributed fixes on the way to drupal 6 update.

Small fixes to private_upload_form_validate:
Removed "Hi Tao" message;
Moved db weight correction here from _admin (and corrected math);
Wrapped messages in t();

Fixed warning by breaking out pu_requirements and _pu_requirements.
Make sure module runs after upload module by bumping weight. Hopefully will address http://drupal.org/node/200537 (thanks schultkl)
http://drupal.org/node/202235: schultkl's Fix for migrating private files if same file attached to multiple roles.

Updating the status checks.
Fixed http://drupal.org/node/201547 No longer using get_header(). Thanks schultkl.
Fixed http://drupal.org/node/199920 PHP4 doesn't like default values for references.
Creating test file in private folder.

Fixes: http://drupal.org/node/199245
Modifies view handing to show private URL.

Cleaning up and testing the status generation functions.

Close to a complete rewrite.

First release