Move all storage to disks

[mzur]

Use storage disks for everything, so object storage can be used instead of a local disk. Check if Swift can handle a few million objects in a single container first (ref). Locally stored items are (checked are using disks):

• [x] Images
• [x] Tiles
• [x] Largo Patches (make public)
• [x] MAIA Patches (biigle/maia#18, make public)
• [x] Thumbs (make public)
• [x] Reports
• [x] Imports
• [x] Geo Overlays
• [x] Video Thumbs (biigle/videos#26, make public)
• [x] Update biigle/distribution with a working default configuration for the new storage disks.

[mzur]

Imports can stay ephemeral. They should be stored only for a few minutes anyway and are not very large or numerous.

[mzur]

As Largo, MAIA and the thumbnails are accounted for, this has no high priority any more. These three account for most of the required storage space.

[mzur]

Video thumbnails will be stored in a storage disk when biigle/videos#33 is merged. This is done.