Permissions Variable is a simple alternative to Features/Strongarm/Hooks based
workflows that introduces global permissions management through $conf that
overrides permissions set in the UI and stored in the database.
The $conf['permissions'] variable is an associative array with permission
machine names as keys and arrays of role names as values. Simply define this
variable inside your settings.php file, or better, in a file included in your
settings.php file, like 'settings.permissions.inc'.