image attach views field produces multiple rows for each attached image

We broke views support with the multiattach patch!

Joining image_attach onto node means we get multiple rows if there are multiple images.
This *might* be desirable, but it's the job of a relationship. A field should only give one row.
So we need to totally change the implementation of the field, and have it as a fake field that does its own query like CCK multiple fields.

Patch on the way.