Ensure that every file in Spack has a license (#2659)

* Ensure that every package has a license

Also fixes URLs with http://http:// doubled.

This is a continuation of #2656.

* Add license to every file in Spack

* Make sure Todd is the author of all packages

* Fix flake8 tests

* Don't license external Sphinx docs

* Don't display licenses in tutorial example packages

Also fixes typos and converts command-line examples
from tcsh to bash, which is more common

var/spack/repos/builtin/packages/hpctoolkit-externals/package.py

@@ -1,3 +1,13 @@
+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License (as