"Multiple values" checkbox displayed on the "Edit group" page is confusing

Issue Summary

The "multiple values" checkbox displayed on the "Edit group" page is very confusing and causing users a lot of extra work trying to figure out what it does (see http://drupal.org/node/209033#comment-941987) . Apparently this is generated by your module because it disappears when I turn it off. That checkbox logically makes a user think they can have multiple fieldgroups, but I'm guessing this only works in your table format. Please label it as relating to Fieldgroup tables and not just fieldgroups. Thanks very much.