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).

More checks on pointers inside annotate because I still can't reproduce the core dumping that Leigh is facing.

IMP: The change to score.cc undoes the change that Rob made some time ago to correct some fixed interface bug. I am not sure what that bug was but if I leave Rob's changes in, assign fails to honour the fixed interface and maps the link onto some other interface.

Annotations work - well, ok, they haven't been rigorously tested yet, but I think they'll hold up. The only thing that is almost certainly broken is the conversion from links with multiple interfaces into the "node + point-to-point" links that assign knows how to deal with.

Mapper now has a flag to determine whether to output the text format or rspec. rspec outputs are named *.ptop.xml and *.vtop.xml for the advertisement and request respectively.