Builder: copy with images(attachments) [test_copy_with_images_as_attachments]

[bobslee]

For a stored Builder with Orbeon image-controls (static, attachment, annotation), these images are stored as "ir_attachment" on the Builder model.

A copy of the Builder should copy these ir_attachment(s) and link/reference to the new Builder record.
This currently fails.

Write unit-test to check whether this happens:

• New ir_attachment objects/records with identical image (datas etc.)
• The new (expected) images are present in the new (copied) Builder XML - And ain't the one from the source (copy) Builder.