Group RAW and JPEG in Pix

[brownphotographic]

As a user of Pix I would like to be able to group JPEG and RAW images. Currently they are shown side by side.

In terms of implementation:

• It would be nice to be able to 'stack' a JPEG/RAW pair together, and allow them to . See Apple Aperture implementation for an idea https://www.youtube.com/watch?v=t18dRKU7kb8
• Perhaps a simple implementation would be to support stacking images by filename? ie images with the same name, but different extension would be grouped