Multiple Simultaneous Uploads and Downloads

[kelp]

Uploading to S3 is pretty slow, but I believe this is just for each node uploaded.

It would be really nice if s3sync could do multiple simultaneous uploads to speed the process.

I intend to use s3sync for copying many many GB (maybe even TB) to s3, but as it, it can take a very very long time.

I believe things could go much much faster if I could 20 or 30 uploads at once. I'm not sure if the same holds true for downloads, but it may.