Refactor long array() syntax to short []

Since app is using PHP 5.4+ already, the longer `array()` syntax can be
refactored to shorter `[]`.

Do not require register global

$token was set to $_GET['token'] if register_globals was set to true.
We all know register_globals are bad, so we better don't require them.

Remove useless copy&paste leftovers

Add an endpoint to list all usernames+names