- Patch #9983 by Stefan: various code style improvements.

The Input formats - filter patch has landed. I still need to make update instructions for modules and update the hook docs.

Here's an overview of the changes:
1) Multiple Input formats: they are complete filter configurations (what filters to use, in what order and with which settings). Input formats are admin-definable, and usage of them is role-dependant. For example, you can set it up so that regular users can only use limited HTML, while admins can free HTML without any tag limitations.
The input format can be chosen per content item (nodes, comments, blocks, ...) when you add/edit them. If only a single format is available, there is no choice, and nothing changes with before.

The default install (and the upgrade) contains a basic set of formats which should satisfy the average user's needs.

2) Filters have toggles
Because now you might want to enable a filter only on some input formats, an explicit toggle is provided by the filter system. Modules do not need to worry about it and filters that still have their own on/off switch should get rid of it.

3) Multiple filters per module
This was necessary to accomodate the next change, and it's also a logical extension of the filter system.

4) Embedded PHP is now a filter
Thanks to the multiple input formats, I was able to move the 'embedded PHP' feature from block.module, page.module and book.module into a simple filter which executes PHP code. This filter is part of filter.module, and by default there is an input format 'PHP', restricted to the administrator only, which contains this filter.
This change means that block.module now passes custom block contents through the filter system.
As well as from reducing code duplication and avoiding two type selectors for page/book nodes, you can now combine PHP code with other filters.

5) User-supplied PHP code now requires <?php ?> tags.
This is required for teasers to work with PHP code. Because PHP evaluation is now just another step in the filter process, we can't do this. Also, because teasers are generated before filtering, this would result in errors when the teaser generation would cut off a piece of PHP code.

Also, regular PHP syntax explicitly includes the <?php ?> tags for PHP files, so it makes sense to use the same convention for embedded PHP in Drupal.

6) Filter caching was added.
Benchmarking shows that even for a simple setup (basic html filtering + legacy URL rewriting), filtercache can offer speedups. Unlike the old filtercache, this uses the normal cache table.

7) Filtertips were moved from help into a hook_filter_tips(). This was required to accomodate the fact that there are multiple filters per module, and that filter settings are format dependant. Shoehorning filter tips into _help was ugly and silly. The display of the filter tips is done through the input format selector, so filter_tips_short() no longer exists.

8) A more intelligent linebreak convertor was added, which doesn't stop working if you use block-level tags and which adds <p> tags.

- Patch #9775 by TDobes: consistency operation.  Changed to "edit foo," "delete foo," and "view foo" links into simply "edit," "delete," and "view".

- Patch #9657: more intelligent theme() function.  Hopefully, Adrian will be
  able to use this patch too.

- Patch #9757 by Al: improved the aggregator help.  Help texts should be to the point.

- Patch #8531 by drumm: took this date parser from MagpieRSS (conveniently GPL). The main benefit here is that timezones are handled properly (I have been noticing increasing complaints about that). I tested with a few feeds of different time formats and time zones and everything appeared correctly in my site's local time. Making this another function adds the benefit of parsability by other RSS (or other contexts) and RSS extension handling functions, where the W3C DTF is recomended.

- Patch #9346 by drumm: improved themability of some aggregator pages.

- Patch #9261 by drumm: made the aggregator overview tables more consistent by adding a items column to the categories table which acts like the same column in the feeds table.

- Patch #8398 by TDobes: changed permissions for the blog, story, and page modules (and all occurrances elsewhere) to match their 4.4.x equivalents.  In the discussion when these permissions were introduced, it was decided that "edit own ..." was clearer, but "maintain personal ..." slipped into CVS HEAD anyway, while "edit own ..." landed in the 4.4.x branch.

Changes are as follows:
"maintain personal blog" -> "edit own blog" (aggregator.module, blog.module, blogapi.module)
"maintain personal pages" -> "edit own pages" (page.module)
"maintain personal stories" -> "edit own stories (story.module)

- More tab-improvements by JonBob: improved support for the default tabs!

- Fixing some usability bugs with aggregator admin: some forms lacked status messages, and redirected to themselves
- Now uses drupal_goto after every form submission [1]. Patches for other modules will follow.

[1] http://lists.drupal.org/archives/drupal-devel/2004-06/msg01147.html

- Patch #8617 by TDobes: changes all gifs to pngs for better consistency (and
  to get of proprietary formats).

- Added forum-sticky.png.  Made by Steven.

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').

- Usability improvement: simplified the administration menu of the aggregator
  module.

- Fixed categorize not working under sources and category views.

- Made the recent news items page, the source pages and the categorization
  pages use pagers.  Removed the 'Items per page' setting and made Drupal
  remember news items much longer.

- Code improvements by JonBob.  Thanks again.

- Fixed feed status not being reset when items are removed.

- Various aggregator module improvements.  Modified patch by drumm.

- 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.

Truncate UTF-8 patch. Introduced a new function truncate_utf8() for chopping off strings at unsure locations, without risking incomplete UTF-8 data.

- System: the 404 setting instructions advise using 'node', this should be '' (redirecting the user to the front page without any message whatsoever is confusing)

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

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

- Renamed CHANGELOG to CHANGELOG.txt for Windows uses.

- Fixed bug #5628: wrong timestamp in aggregator.  Patch by BartJ.

- Fixed bug in image parsing: caused 'Array' to be printed on the screen.