Ajax form page callback require updates for Drupal 7.27

#1 works for me just for 1 site. On an other site, still no showing hierarchical terms. Thanks

I was having issues with the HS working on cached pages because of a stale form_build id and it was failing on all subsequent submissions after the first. This appears to be because of change introduced in Drupal 7.27 as well.

After looking at several implementation of ajax_deliver callbacks I did not notice anyone, other than the file_upload, doing this. Furthermore, I am not sure if it necessary now because ajax_form() looks up the form based on the form_build_id and when not available errors out.

With that I have adjusted the hierarchical_select_ajax() to mimic other imlementations like field_collection and ctools. http://cgit.drupalcode.org/field_collection/tree/field_collection.module...

Thanks,

Jonathan

Committed, thanks!