Yes, actually tested it this time...

Change to use the realpath function in the 'Cwd' module instead of
calling realpath via the shell.  The shell command varies in its
reaction to a missing final path component.  On some platforms (Linux,
FBSD10+) realpath reports an error if the final component doesn't exist
on the filesystem.  On others (FBSD < 10), it does not report an error.

The perl function from 'Cwd' emulates the same behavior as FBSD prior to
version 10, which is the behavior the scripts expect.

From here on out, instead of using `realpath`, do the following:

use Cwd qw(realpath);
..
..
my $realpath = realpath($somepath);

This commit is intended to makes the license status of Emulab and
ProtoGENI source files more clear.  It replaces license symbols like
"EMULAB-COPYRIGHT" and "GENIPUBLIC-COPYRIGHT" with {{{ }}}-delimited
blocks that contain actual license statements.

This change was driven by the fact that today, most people acquire and
track Emulab and ProtoGENI sources via git.

Before the Emulab source code was kept in git, the Flux Research Group
at the University of Utah would roll distributions by making tar
files.  As part of that process, the Flux Group would replace the
license symbols in the source files with actual license statements.

When the Flux Group moved to git, people outside of the group started
to see the source files with the "unexpanded" symbols.  This meant
that people acquired source files without actual license statements in
them.  All the relevant files had Utah *copyright* statements in them,
but without the expanded *license* statements, the licensing status of
the source files was unclear.

This commit is intended to clear up that confusion.

Most Utah-copyrighted files in the Emulab source tree are distributed
under the terms of the Affero GNU General Public License, version 3
(AGPLv3).

Most Utah-copyrighted files related to ProtoGENI are distributed under
the terms of the GENI Public License, which is a BSD-like open-source
license.

Some Utah-copyrighted files in the Emulab source tree are distributed
under the terms of the GNU Lesser General Public License, version 2.1
(LGPL).

/var/tmp, and remove a copy-pasted comment.

directory.