Added additional username check in form files.

Till Brehm

2014-08-13 3ee67a99739154fa5fab3a041edabc14415d4e70

 interface/web/sites/form/shell_user.tform.php

@@ -93,6 +93,13 @@
            1 => array ( 'type' => 'REGEX',
               'regex' => '/^[\w\.\-]{0,32}$/',
               'errmsg'=> 'username_error_regex'),
            2 => array(
                     'type' => 'CUSTOM',
                     'class' => 'validate_systemuser',
                     'function' => 'check_sysuser',
                     'check_names' => true,
                     'errmsg' => 'invalid_username_txt'
                  ),
         ),
         'default' => '',
         'value'  => '',