DS_FIELD_TYPE_FUNCTION does not work at all

Hi,

I tried to create a display suite field of the function type.
Unfortunately it didn't work for me.

After some research I found that the ds_get_field_value() function tries
to access $field['function'] which was not set by the ds_ds_fields_info()
function:

$fields[$entity_type][$key] = array(
  'title' => $field->label,
  'field_type' => $field->field_type,
  'properties' => $field->properties,
 );

So there might be two possible solutions:

1) Move the function attribute into the properties array:
$field['properties']['function']
2) Change ds_ds_fields_info to copy the file and function properties:

$fields[$entity_type][$key] = array(
  'title' => $field->label,
  'field_type' => $field->field_type,
  'properties' => $field->properties,
  'function' => $field->function,
  'file' => $field->file, 
 );

I guess the first approach is cleaner as there is already a properties array.