Post #1434271

@Thorsted BTW from what I see it would be really easy to add Grok support to the Bodleian tool. Mostly a matter of creating a copy of the Kakadu wrapper module (here: https://github.com/bodleian/image-processing/blob/master/image_processing/kakadu.py) and then adapt it into a Grok module, and then perhaps adding some imports into the higher-level modules.