Fix for refactored field groups for D7 and added recursive functions

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/**
 * Attach groups to the form.
 */
function field_group_attach_groups(&$form, $view_mode) {

$entity_type = $form['#entity_type'];
  $bundle = $form['#bundle'];

$form['#groups'] = field_group_get_groups($entity_type,$bundle, $view_mode);

// Create a lookup array.
  $group_children = array();
  foreach ($form['#groups'] as $group_name => $group) {
    foreach ($group->children as $child) {
      $group_children[$child] = $group_name;
    }
  }
  $form['#group_children'] = $group_children;

// Nest the fields in the corresponding field groups.
  field_group_nest_fields($form, $form);

}

/**
 * Recursive function to nest fields in the field groups.
 * @param $form
 * @return void
 */
function field_group_nest_fields(& $element, & $form, $parent = NULL) {

$groups = $form['#groups'];
  $group_fields = $form['#group_children'];

foreach ($groups as $group_name => $group) {

// Add fieldgroups to the current element.
    if ((empty($group->parent_name) && !isset($parent)) || $parent == $group->parent_name) {
      $element[$group_name] = array(
        '#type' => 'fieldset',
        '#title' => $group->label,
        '#weight' => $group->weight,
        '#collapsible' => TRUE,
        '#collapsed' => FALSE,
      );

foreach ($group_fields as $groupfield => $groupname) {
        // Stash the field in the group.
        if ($groupname == $group_name && isset($form[$groupfield])) {
          $element[$group_name][$groupname][$groupfield] = $form[$groupfield];
          unset($form[$groupfield]);
          unset($form['#group_children'][$groupfield]);
        }
      }

unset($form['#groups'][$group_name]);
      field_group_nest_fields($element[$group_name], $form, $group_name);

}

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Fix for refactored field groups for D7 and added recursive functions