- variable_del(): small improvement/fix

  default value instead.

- Moved most of the options in structure.module to node.module.  The
  structure.module either needs work, or replacement by index.module:
  see "admin > node > node settings".

  It will do for now and it can always made better when we can think
  of a better solution; it is the best I could think of.   Now what?
  index.module or structure.module?  I'm currently pro index.module.

- Drastically simplified "variable.inc".

- Removed most dependecies on structure.module from all content related
  modules.  Thus making our modules more modular.  ;)

- Fixed calculation glitch in queue.module.

- Fixed potential function name clash/conflict in rating.module, and
  simplified some code on my way.

- Started removing all global variables $status and $rstatus.  Global
  variables are "yucky" so in near future, we will replace all global
  $status variables by a call to node_status().  Originally, $status
  was only introduced as a temporary hack and nothing is as permanent
  as a temporary hack so I took it out when still possible.

- Changed the watchdog messages a bit.

- Removed includes/timer.inc: it has been integrated in common.inc.

- Fixed a bug in node.php: UnConeD forgot to update 1 node_get_object().

- I changed the look of theme_morelink() a bit: it might not look better,
  but at least the output is "correct".

- Various small improvements.

- Redid settings.module and even renamed it to conf.module.
    * Settings are now grouped in basic categories like "system
      settings", "module settings" and "filters".
  * Added new settings to make Drupal easier to configure and
  to make some aspects like the watchdog scale better.

- Renamed includes/settings.php to includes/conf.php.

- Added filter support to conf.module and introduced filter hooks so
  modules can implement and export new filters.  Example filters are
  an HTML filter (implemented), a profanity filter, an url converter,
  ASCII smileys to images filter and so on ...

- Reworked the check_* functions: user contributed content/input is
  only verified and filtered once in its lifespan.

NOTES

- Altough this is a large commit, no database changes are required.

CHANGES:

- Rewrote the cron system.  Removed cron.module and moved all cron
  related options to settings.module.  Cron was a confusing thing:
  it has been made simpler both in terms of code and configuration.

   + You had to rehash your modules to make the cron show up in
     the list.  This is no longer required.

   + You couldn't tell what cron "watchdog" or cron "story" were
     up to.  Instead, we now display a clear description message
     for every cron involved.

   + The user interface of setting.module - and the admin section
     in general, looks a bit ackward but I couldn't care less and
     don't want to see this improve at the time being.

- Improved setting.module:
   + Now uses variable_set().
   + Added some help and documentaition on how to setup cron.

- Improved ./export.

- Updated CHANGELOG.


TODO:

- I'm now going to look into UnConeD's question with regard to
  check_output() and $theme->node(), as well as the filter and
  macro stuff.  I'll probably be fine-tuning setting.module a
  bit more on my way.

Another big update so please read this carefully because there is important information hidden in it.

Made it so that we can disable/enable comments on a category by category basis. In order to accomplish this I had to make a few (*temporary*) changes.

I moved all comment code from the "module level" (eg. story.module) to the "node level".  It was nothing but the logical next step in nodifying drupal.  This enables us to add comments to all existing content types including book entries.  But also for book entries, this to can be toggled on and off. :-)

Moreover module writers don't have to worry about the complex comment logic: it is "abstracted" away.  This implies that story.module got smaller, faster and easier to comprehend. :-)

In order to accomplish this, I had to update ALL THEMES, which I did - and on my way I updated Goofy, Oranzh and UnConeD - with the previous changes.  All themes are up-to-date now!  I also had to remove the [ reply to this story ] links, and temporally re-introcuded the "Add comment" button in the "Comment control".  Tempora lly that is, UnConeD. ;)

I plan to upgrade drop.org either tommorow or wednesday so test away if you have some time to kill. ;)

Oh, I also fixed a few bugs and made various small improvements.

Large commit, read it carefully, and make the required changes to
your theme:

- corrected some missing translations in story.module.  Oops!
- grealty simplified the "moderation threshold mechanism"(tm) so
  that module writers don't have to worry about this.  As a result
  story.module and book.module became a bit smaller and easier to
  grasp.
- greatly simplified new "category" and "topic" code which is soon
  going to replace the "section" code.  Needs more work though so
  hang on thight.
- includes/section.inc and modules/section.module are replaced by
  includes/structure.module and modules/structure.module.
- beautified example.theme a bit without adding HTML complexity:
  it is a good example but still useful as a theme
- made theme example use "categories" and "topics"
    --> TAKE A LOOK AT IT AND UPDATE YOUR THEME
- made theme marvin use "categories" and "topics"
    --> TAKE A LOOK AT IT AND UPDATE YOUR THEME
- added 2 new "story listings" to administrator interface of
  story.module to verify story integrity.
- optimized comment table a bit (work in progress)

A lot of small changes (search-n-replace) make a big commit:

  - fixed update bug in book.module
  - provide a log message when both adding and updating book pages
  - all configurable variables are now accessed through "variable_get()":
  - rewrote watchdog and submission throttle and removed watchdog.inc
  - improved robustness of sections.inc
  - imporved story.module
  - updated ./database/database.sql