Add tomo projection images to mammo import extractor
Hologic mammography digital breast tomosynthesis objects have a corresponding object that contains the projection images. These are of class UID 1.2.840.10008.5.1.4.1.1.7 which is secondary capture, but with a modality of MG.
Current mammo extractor checks for either 'for processing' or 'for presentation' images, so rejects these projection objects.
Modify to check all these objects without allowing other SC objects.