Patch for fieldset handling

Attached is a patch to check if the form element is a fieldset and then loop through the fields contained in it. The outcome will be a template array variable with the child fields.

Example:

Content Type Setup
--title
--body
--group_bio
----name
----age
----city

The template will have the following vars
$title
$body
$group_bio = array(
--'name' => $name
--'age' => $age
--'city' => $city
)