Add package for muscle (#4616)

* Add package for muscle

Minimally tested on CentOS7.

* Convert to MakefilePackage

Do it the easy way...

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

@@ -0,0 +1,40 @@
+##############################################################################
+# 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 NOTICE and LICENSE files 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
+# published by the Free Software Foundation) version 2.1, 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 Lesser 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 Muscle(MakefilePackage):
+    """MUSCLE is one of the best-performing multiple alignment programs
+       according to published benchmark tests, with accuracy and speed
+       that are consistently better than CLUSTALW."""
+
+    homepage = "http://drive5.com/muscle/"
+    url      = "http://www.drive5.com/muscle/muscle_src_3.8.1551.tar.gz"
+
+    version('3.8.1551', '1b7c9661f275a82d3cf708f923736bf8')
+
+    def install(self, spec, prefix):
+        mkdirp(prefix.bin)
+        install('muscle', prefix.bin)