by joachim: Added base operation handler for form operations using Batch API.
by joachim: Fixed entity_operations_get_operation() completely broken.
by joachim: Added a Views area handler for outputting an entity operation.
by joachim: Changed static variable to be a class variable in admin UI controller, so subclasses may use it.
by joachim: Fixed operations with '-' in the operation name producing form IDs that are invalid for hook_form_FORM_ID_alter().
Merge tag '7.x-1.6' of git://drupalcode.org/project/entity_operations