[Bug 143] Add reference to "rsync" in FAQ and documentation.

[Yuliy Minchev]

> If you want to only copy changed files using ssh's security features,
> use rsync(1) with the option --rsh="ssh", e.g.,
> rsync -a --rsh="ssh" /home/joe/stuff joeuser at joe.com:/home/joeuser/stuff

or

rsync -av -e ssh /home/joe/stuff joeuser at joe.com:/home/joeuser/stuff

or

use rsync(1) with the option -e ssh or --rsh="ssh", e.g.,

> It's short, it's simple, and it shows people how to do it.
> If you don't like the example, drop everything after the "e.g.", but at least
> tell people about rsync, what it does, and its --rsh option.
> Just a "see also" to rsync won't tell people WHY they should also see that
> program.
> 
> Thanks.  I'm just trying to make sure that users can use this great tool
> (OpenSSH) using only the documentation they get... :-).

-- 
  Yuliy Minchev, 
  UNIX Administrator