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Checks whether or not a username is valid

void RegisterCheckUsername ()

Uses the check_username sub-template of the XML template
Expects the username to be passed via the query string
Cleans up the username and trims it if neccessary
Used to indicate whether or not your desired username is valid on the registration form
Checks to make sure it isn't reserved, doesn't contain invalid characters and isn't the same as $txt['guest_title']

**Context ($context) Variables**
Name	Description
$context['checked_username']	The username to check. Set from $_GET['username'] (or set to an empty string if $_GET['username'] doesn't exist)
$context['valid_username']	Whether or not the username is valid