downloadList enhancements

[bic-ed]

• [x] Include dynamic albums as well
• [x] Fix duplicate sidecars appearing with case insensitive servers
  • [ ] Allow rescue of sidecars with uppercase suffixes
  • [ ] Add an option to include sidecars in the zip file?
  • [ ] Sidecars for resized images as well?
• [x] Handle properly album_name.zip files in download statistic, as currently they result missing even if the album is present. Statistics for album download get erased by pressing the "Clear outdated downloads from database".
• [ ] Merge the old error page [pageError()] with the new one [noFile()]
• [ ] Add a button to album admin page for selectively allow/disallow downloads on each individual album
• [ ] Non-image files cannot be downloaded if the Resized Images option is selected;
  • [ ] add a note next to the option or
  • [ ] provide those as well.