+ description field isn't marked as requiered
   +when the field isn't unique, an error is displayed, but the wrong text field is set as erronous.

  TODO: document the defaults in the PHPdoc comments.

  TODO: we should write down a couple guidelines for these document them in
        the PHPDoc code of drupal_set_message()!  .

- Patch 20910 by chx: centralize print theme page.

- Patch #19965 by Robin Monks: fixed problem with duplicate block titles.

- Modified patch #19694 by chx: makes sure that block.module deals by default only with regions 0 and 1 as it does now but lets you use block_list with any region you define. This opens many possibilites. You may do a multi region module, with your admin UI using the blocks table as storage and the block_list matcher. Or you may do a sections module using the block matcher without cluttering the current blocks list.

- Patch #18382 by Neil: usability improvement: organized the blocks on the block administration page by region. (I wanted to do that myself!)

- Patch #16074 by Andre Molnar: add configuration option to show blocks only on pages of certain node type.

- Removed some cruft: left-over xxx_help_page() functions.

- Patch #14209 by nysus: improved the clarity and readability for a group of radio buttons for a block's visibility settings.

- Patch #12353 by Stefan: usability improvement: don't show 'throttle fields' unless the throttle module is enabled.

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

   + throttle module: flush cache when the throttle enables/disables
   + throttle module: prevent throttle being enabled by 0 users or guests when disabled
   + system module: remove requirement for statistics.module
   + block module: update help text to reflect access log is no longer required
   + statistics module: throttle is now enabled/disabled, not using levels 0-5

  * There are only two throttle levels instead of 5, namely 'enabled' and 'disabled'.  This makes it a _lot_ easier to predict when the throttle will kick in.  However, if you maintain a module that is throttle-aware, it needs to be updated!

  * The throttle mechanism now uses the current number of anonymous users or the current number of authenticated users to kick in.  This is a _lot_ more intuitive than the old throttle mechanism.

  * The throttle block has been removed -- you can now use the "Who's online" block to determine the good throttle settings.

  * Most of the documentation has been removed because it was deprecated.

  * It's less code!

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 #10677 by drumm: removed dead code.  Leftover.