support print file for each artwork

[slivingston]

Provide basic support for the storing, searching, changing of print-files, which are files of images of various types and dimensions that are used for creating prints of artwork. Requirements:

1. optionally upload a new print-file.
2. optionally replace an existing print-file.
3. associate an arbitrary number of print-files with the same artwork.
4. export bundle of print-files of selected artworks, including CSV summary of artworks.
5. download a single print-file as part of UI for viewing details of an artwork.
6. automatic generation of print-files from original images.

[slivingston]

injection from artworks to print-files (i.e., one print file per artwork), which are ready to be printed.

[slivingston]

from the list of requirements in the OP, do not include "replace an existing print-file" in current work. From discussion with Naomi and Kun, it seems that the print-file would only rarely or never be changed, and if it were to change, most or all print-files would need to be changed. As such, the ability to manually replace print-files per artwork is not a desired feature.

[slivingston]

from discussion with Naomi and Kun, curators will typically want to download print-files, not original raw images. There are some cases for special proposals where raw images could be needed, but less frequently.

[xstephen95x]

In terms of storage, in each artist's folder in the art-uploads bucket,

• the original (fullsize) is stored in /uploads
• thumbnails are stored in /thumb128 and /thumb512
• printfiles are stored in /printfiles

Where, in each folder, an artwork would have the same file name, which is the artwork_uid

[xstephen95x]

Dependent on issue #53