[dev] Lowercasing usernames in signup

[Jeff Seifert]

Currently, when a user signs up through signup.php, the system automatically
lowercases the username.  From horde/signup.php:

    function addSignup($info)
    {
        global $auth;

        $info['user_name'] = String::lower($info['user_name']);

However, there's no indication given to the user that their username has been
mapped to lowercase, and when they try to login using their uppercased
username, they get an error.

It seems to me that either this line shouldn't be here in signup.php or the
login page should be lowercasing the username input as well.

-Jeff
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