- detect presence of remsh and use it instead of rsh

- handle directory ownership and permissions much better.

- fix bug where links caused the permissions of files to be
set incorrectly

- override the default umask in setting file permissions

- better handling -o and -D being passed to non-root users

- handle rsync to a destination of /

- fix the handling of mismatched file types at either end of the
link. For example, if the destination is a link and the source is not.