new package: blat (#3610)

* Add package for blat

* Whitespace cleanup

* Flake8 cleanup

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

+##############################################################################
+# 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
+# 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 Blat(Package):
+    """BLAT (BLAST-like alignment tool) is a pairwise sequence 
+       alignment algorithm."""
+
+    homepage = "https://genome.ucsc.edu/FAQ/FAQblat.html"
+    url      = "https://users.soe.ucsc.edu/~kent/src/blatSrc35.zip"
+
+    version('35', '16e546b8843b85e0b0f2fa603cd78724')
+
+    depends_on('libpng')
+
+    def setup_environment(self, spack_env, run_env):
+        spack_env.set('MACHTYPE', 'x86_64')
+
+    def install(self, spec, prefix):
+        mkdirp(prefix.bin)
+        make("BINDIR=%s" % prefix.bin)