Clean up log output for intermittent failures

When downloading with many threads, log output for intermittent network failures can be overwhelming. This release contains a modification to prevent many threads from complaining about an intermittent failure simultaneously.

This release also contains a fix to 'ls_manifest' where a '/' was missing between the folder path and file name for subdirectories in a project.

MD5sum for tarball: 8f68f0d4b61ae2ec3e534dfcd5aabf4e