DSS/SDSS URL and Usage Policy fixes
Three changes:
-
Update DSS URLs to
https://
-- they were failing to get the images because we were instead served a HTML redirect. -
Update SDSS URL to Data Release 16, and remove the plotted object annotations on the image.
-
Fix the usage policy notice on DSS -- the images are not in public domain according to the usage policy here https://archive.stsci.edu/data_use.html