Merge branch 'mplegendre-multi_pkgsrc_roots' into develop

- This moves var/spack/packages to var/spack/repos/builtin/packages.

- Packages that did not exist in the source branch, or were changed in
  develop, were moved into var/spack/repos/builtin/packages as part of
  the integration.

Conflicts:
	lib/spack/spack/test/unit_install.py
	var/spack/repos/builtin/packages/clang/package.py

var/spack/repos/builtin/packages/texinfo/package.py

@@ -0,0 +1,46 @@
+##############################################################################
+# Copyright (c) 2013, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Written by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://llnl.github.io/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 General Public License (as published by
+# the Free Software Foundation) version 2.1 dated February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+
+from spack import *
+
+
+class Texinfo(Package):
+    """
+    Texinfo is the official documentation format of the GNU project. It was invented by Richard Stallman and Bob
+    Chassell many years ago, loosely based on Brian Reid's Scribe and other formatting languages of the time. It is
+    used by many non-GNU projects as well.FIXME: put a proper description of your package here.
+    """
+    homepage = "https://www.gnu.org/software/texinfo/"
+    url      = "http://ftp.gnu.org/gnu/texinfo/texinfo-6.0.tar.gz"
+
+    version('6.0', 'e1a2ef5dce5018b53f0f6eed45b247a7')
+    version('5.2', '1b8f98b80a8e6c50422125e07522e8db')
+    version('5.1', '54e250014fe698fb4832016158747c03')
+    version('5.0', '918432285abe6fe96c98355594c5656a')
+
+    def install(self, spec, prefix):
+        configure('--prefix=%s' % prefix)
+        make()
+        make("install")