- Patch #19451 by JonBob: improved consistency of module descriptions.  We should write guidelines for this -- maybe in the PHPDoc code of the _help hook.

http://drupal.org/node/19012#comment-32381

- Patch #14731 by chx: made it possible to rewrite node queries.

  We added a 'severity' column to watchdog():
    watchdog($type, $message, $link) --> watchdog($type, $message, $severity, $link);

    * Specify a severity in case you are reporting a warning or error.
    * The $link-parameter is now the fourth parameter instead of the third.

  TODO: document this in the upgrade guide.

- Refactored the queue module: removed the queue module's field from the node table.  With help from Gerhard.

- Slight addition to INSTALL.txt with regard to PHP versions.

- Updated/reworded some node type descriptions as per Boris' suggestions.

- Adding missing {} around a table name in update.php.

- Patch #12783 by Stefan: various small consistency/usability improvements.

The primary goal of this patch is to take the 'custom' and 'path' columns of the block overview page and make them into something understandable. As of Drupal 4.5 'custom' lacked an explanation which wasn't buried in help text and path required dealing with regular expressions.

Every block now has a configuration page to control these options. This gives more space to make form controls which do not require a lengthy explanation. This page also gives modules a chance to put their block configuration options in a place that makes sense using new operations in the block hook.

The only required changes to modules implementing hook_block() is to be careful about what is returned. Do not return anything if $op is not 'list' or 'view'. Once this change is made, modules will still be compatible with Drupal 4.5. Required changes to core modules are included in this path.

An additional optional change to modules is to implement the additional $op options added. 'configure' should return a string containing the configuration form for the block with the appropriate $delta. 'configure save' will come with an additional $edit argument, which will contain the submitted form data for saving. These changes to core modules are also included in this patch.

- Patch #8179 by JonBob: reintroduced menu caching.

- Patch by JonBob: for consistency and readability, add brief descriptions of each source file inside the @file comment block at the head of the file. This helps with Doxygen indexing, and also allows neophytes to see what a file does immediately on opening the source, regardless of the organization of the hooks.

- Code improvements by Stefan: use capital letters for header titles (and added some missing t() functions).

- Code improvements by Stefan: made all status messages consistent (and easier to translate).

Tabs patch!

CHANGES
-------

 + Introduced tabs. First, we extended the menu system to support tabs. Next, a tab was added for every link that was (1) an administrative action other than the implicit 'view' (2) relevant to that particular page only. This is illustrated by the fact that all tabs are verbs and that clicking a page's tab leads you to a subpage of that page.

 + Flattened the administration menu. The tabs helped simplify the navigation menu as I could separate 'actions' from 'navigation'. In addition, I removed the 'administer > configuration'-menu, renamed 'blocks' to 'sidebars' which I hope is a bit more descriptive, and made a couple more changes. Earlier, we already renamed 'taxonomy' to 'categorization' and we move 'statistics' under 'logs'.

 + Grouped settings. All settings have been grouped under 'administer > settings'.

TODO
----

 + Update core themes: only Xtemplate default supports tabs and even those look ugly.  Need help.

 + Update contributed modules.  The menu() hook changed drastically.  Updating your code adhere the new menu() function should be 90% of the work.  Moreover, ensure that your modue's admin links are still valid and that URLs to node get updated to the new scheme ('node/view/x' -> 'node/x').

- Patch #8405 by Adrian:
   + Fixed duplicated view.
   + Fixed node types not being picked up correctly.
   + Improved error handling in case a particular node has not been found.

- Added support for 403 handling.  Patch by JonBob.  As a side benefit,
  administrators will be able to define a custom 403 page, just as they
  can define 404 pages now.

  This needs to be documented in the "Changes since / migrating to ..."
  pages.

- Patch by Steven: removed redundant permission checks.  These are no longer
  required thanks to the new 404 handling.

- Patch #5111 by Bart: fixed inconsistent default values.

- Patch 5592 by Goba: let drupal_map_assoc() rule.  :-)

- Renamed CHANGELOG to CHANGELOG.txt for Windows uses.

  Uses drupal_set_message() so the message doesn't interfeer with non-HTML
  formats (posting using blog API etc).

- Patch #5281: removed hardcoded table and CSS from the queue module.  Made
  the queue page-able.  Patch by Stefan.

- Patch 5256: code improvements: theme('header') + theme('footer') -> theme('page').
  Patch by Gerhard.

- Fixed bug 4652: node loses its terms after getting promoted, declined or expired.

- Patch 185 by Ax: fixed undefined variables, synchronized xtemplate with sf, etc.

- Committed phase 4 of JonBob's menu system changes.

- Synchronized some page and link titles.

- Committed phase 3 of JonBob's menu changes.  Adds an API for modules to
  define titles and breadcrumbs for their pages, and updates the theme
  system to display them.

- Patch by JonBob:

  Phase 2 of the menu system integration project. This unifies the interface
  used by admin and non-admin pages, and deprecates the _page hook in favor of
  explicit callbacks from menu(). Breadcrumbs, titles, and help text go away
  as a result of this patch; they will return in the phase 3 patch, printed
  by the theme.

- Committed stage 2 of the theme system improvements!  Patch by CodeMonkeyX.

- Committed stage 1 of the menu callbacks improvements.  Patch by Jonathan.

- Committed part 3 of Michael's help system improvements: removed the $help
  parameter from the menu() function.

- Bugfix: inserting and updating paths was not working.  Patch by Matt.

- Bugfix: updated the queue module menu so the "view submission" link appears
  in the navigation when enabled.  Patch by Matt.