#367267: Reverting line needed for multigroup support, since it breaks groups until the multigroup patch is applied.

#397578: Uncouple ImageField from custom FileField hooks. Implement ImageField as a dependent widget for FileField.

#387194: Major FileField UI Refactoring. Putting File info side-by-side the preview, hiding fields that are unnecessary before uploading a file.

#303286 by dopry, drewish, moonshine, Add field to file during validation so it is available during hook_file_insert.

#291383 by webchick, hook_file_download() causes 404 for filefield-derived fields on private download

#295620, Call to undefined function field_file_load().. decided to include field_file.inc at a global level.

#310698 by dopry, update the default value callback to only display a single extra filefield by default. There are still upstream issues with cck, see http://drupal.org/node/320313#comment-1083296

reset item to default value when remove is selected instead of just changing fid to 0 so description field gets erased.