feature 2089: implement the "Bulk Manager" plugin as the new "Batch Manager".
The new "Batch Manager" offers as many features as the old "Bulk Manager" and
more to come.
The old Batch Manager (Caddie/Recent Pictures) is not removed yet and changes
that occured since last summer are not reported yet in the Batch Manager:
category/album, photo order for a given album, deletion of synchronized photos.