#128038 Backport content_field_instance_collapse() and content_field_instance_expand() to make it easier to send field values to drupal_execute.

 are moved from 'node_' to 'content_' namespace)
+ fixes for older 4.7 versions migration path
update.php required !!

(+ remove test api hook, since we don't ship with testfile anymore)

 and KarenS

#104259 add code to create node_content tables and function content_types_rebuild() to fix database if content types are added when CCK is not enabled.

Now that content type delete hook is implemented in core, need a slight fix to cck handling of deletion to make sure field table exists before trying to delete it.

Finish moving delete operations into content_crud.inc to match 4.7 version and add new node_type hook to handle node type changes