Provide checksum files

As of v2.3.0-alpha, file checksums can be displayed below the file name. Enable process_checksum in the general settings. Supported checksum types are listed under checksum_files.

Example:

# Create files
$ echo "Not an ISO image" > somefile.iso

# Create checksums
$ shasum somefile.iso > somefile.iso.sha1sum

# List files
$ ls -1
somefile.iso
somefile.iso.sha1sum

With both files uploaded to your public folder, the dear listing should now show the checksum below the file name.