ruloweb's sandbox: Admin paths

Make D7 admin paths functionality available to D6.

Backported functions:

path_is_admin()
Determine whether a path is in the administrative section of the site.

path_get_admin_paths()
Get a list of administrative and non-administrative paths.

hook_admin_paths()
Define administrative paths (http://api.drupal.org/api/drupal/modules%21system%21system.api.php/funct...).
Backported all hook_admin_paths() core modules.

Requirements / Dependencies

1. Ctools