Remove the need for rdist(1) to run setuid, thus completely closing any

possibility of a security hole.  It now does what rdist-6 does, and calls
/usr/bin/rsh if not running as root.  There are NO protocol changes, this
is 100% compatable with the old rdist, except that it does not need setuid
root privs.

However, there are some minor differences to the base rdist-6 code in that
if it is being run by root, it will call rcmd(3) directly rather than
piping everything through rsh(1).  This is a little more efficient as it
doesn't involve context switching on pipe reads/writes.

Also, the -P option was added from rdist-6.1.2, which allows an alternative
rsh program to be specified, such as ssh.  Note that it requires the fixes
to the ssh port to disable the unconditional USE_PIPES option that was
recently added.  The rcmd(3) optimisation is disabled if a non-rsh program
is speficied.

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