admin_menu 5.x-2.0

Drupal Administration Menu v2 comes with many great developer features and usability improvements.

• The icon links to a site's front page now and has turned into a menu.
• Links to the special pages 'Run cron' and update.php are displayed in the icon menu.
• hook_admin_menu() allows other modules to add or alter the administration menu.
  A first example is included in this release (devel_admin_menu()), which adds the most often used links "Empty cache" and "Variable editor" from Devel module's block to the icon of administration menu. Furthermore, links to switch to another user are displayed on the logout button.
• Administration Menu displays the current amount of anonymous and authenticated users on the site.
• Links to Drupal.org issue queues of Drupal core and contrib modules are displayed in the icon menu. Only users with the 'display drupal links' permission will see them.

All changes:
Added devel_admin_menu() for fast access to clear-cache, variable editor and switch_user.
Added username to logout button.
Added hook_admin_menu() to allow other modules to alter admin_menu.
#194189 by sun: Added counter for current anonymous/authenticated users.
Added Drupal.org project issue queue links for all enabled contrib modules.
#189701 by sun: Changed admin_menu icon to be a menu.
#193925 by sun: Removed obsolete menu slicing code.
#193669 by smk-ka: Moved admin_menu builder functions into include file.