Enhancement: Do rsync file list in reverse order (or newest files first)

[drewm27]

So during a gigantic backup copy where we hard link similar files with -H, older files get copied first and then our backup system removes them from the source, giving us the problem where we are copying the same file over and over.

Having a flag to copy the newest files first would go a long way towards making this easier and more optimal for us.

Right now I'm implementing this with multiple tiered rsync jobs where I copy today's files first, then another rsync job with the month's files, then another rsync job with all files and it's pretty hacky.