added the additional code that's need in the elgg engine reg function

README

@@ -41,6 +41,17 @@ http://ucommjuhl.unl.edu/UNL_Elgg/elgg, change it!)
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 -Altered /elgg/engine/lib/users.php to bar registration of accounts starting with "unl_"
 
+	function register_user($username, $password, $name, $email, $allow_multiple_emails = false, $friend_guid = 0, $invitecode = '', $isfromSSO = false) {
+	
+		// Check to see if $username begins with "unl_"
+			if($isfromSSO==false)
+			{
+				if ( "unl_" == substr($username,0,4) ) {
+					//return false;
+					throw new RegistrationException("Username cannot begin with 'unl_'");
+				}
+			}
+
 
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 ** Plugin info