Added a keyword argument view_set_queue_entry, which disables or enables
the bidirectional connection between the queue entry and corresponding
view.

Useful: when composing a task of several already existing QueueEntry
objects but still maintaining the original entry-view relationship.
Not using the deprecated queue model factory to create nodes.
Composed characterizations of two queue entries, one for taking the
reference images (reusing the CollectionQeueuEntry) and one for doing
the actual characterization.