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Execute termination listeners, including the subscriber formerly known as drupal_page_footer() and now represented by this class.

Add the request object to a collector function for the time being. This requires doing a partial bootstrap to get the class loader working, since BOOTSTRAP_FULL requires the request to already be in place.

Convert DrupalKernel into simply a DrupalApp class, since all of the kernel-y stuff is happening in HttpKernel anyway.

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #599804 by effulgentsia, catch: unify page, AJAX 'path', and AJAX 'callback' callbacks. Oh my, this is the beginning of something big.

#363013 by mannkind: Use getwd() rather than realpath(__FILE__) to determine drupal root, so we don't break symlinks.

- Patch #351235 by dmitrig01, webchick, frando, moshe weitzman, et al: hook_page_alter.  Oh, behave.

- Patch #225450 by Crell, chx, bjaspan, catch, swentel, recidive et al: next generation database layer for Drupal 7.

- Patch #174226 by keith.smith, pwolanin et al al -- and greatly simplified by me: added a copyright notice.

  (Untested because the admin/settings page doesn't work yet.)

  up the documentation a little.

  chx: can you double-check whether the global $conf variable is secure?
       (That is, make sure it can't be send using the URL or something.)

- Patch 20910 by chx: centralize print theme page.

- 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.

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

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').

- 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.

  configurable!  Menu items can be disabled, repositioned, added and
  so on.

  Upgrading to requires you to run update.php.

  This functionality depricates some of the 'navigation modules' in the
  contributions repository.  Furthermore, modules can now 'suggest'
  menu items and site adminstrators can choose to enable them.  Modules
  in the contributions repository should try to take advantage of this.

- Reworked 404 (page not found) handling.  Patch by walkah.  You can specify a
  custom 404 page in the administration page.  As a result, error.php could be
  removed.

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

- 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.

- Removed duplicate call to drupal_page_header().  Patch by Moshe.

- Fixed sess_write().
- Removed dead code in index.php.

- Improved module loading when serving cached pages.  Moshe's bootstrap patch.

- Used legend and fieldset tags for the configuration page.