Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

$Id$ -> $FreeBSD$

Add some examples of how to throw a window up on your display when
the peer demands authentication, and add some more detail to the
example configurations.

This is the first time I've written any TCL, so I'd appreciate it
if someone eyeballed the *-auth stuff and fixed any glaring problems.