New option: --progress-newline

[Ryan T. Sammartino]

In trying to write a nice GUI for rsync, it was difficult to read
rsync's stdout
when using --progress, as --progress uses \r to make things pretty on
a terminal,
but it's painful to read into another process.

The attached patch made it much easier for me to read and parse the output from
--progress by adding a command-line option --progress-newline, which simply
causes --progress to use \n instead of \r for eol to ease reading stdout.

I hope this is useful.
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