New package for the Mercurial (hg) version control system (#1644)

* New package "mercurial"

* Disable self-checks

The self-checks require subversion, which we don't want to require.

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

@@ -0,0 +1,44 @@
+##############################################################################
+# 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 Mercurial(Package):
+    """Mercurial is a free, distributed source control management tool."""
+    homepage = "https://www.mercurial-scm.org"
+    url      = "https://www.mercurial-scm.org/release/mercurial-3.9.tar.gz"
+
+    version('3.9'  , 'e2b355da744e94747daae3a5339d28a0')
+    version('3.8.4', 'cec2c3db688cb87142809089c6ae13e9')
+    version('3.8.3', '97aced7018614eeccc9621a3dea35fda')
+    version('3.8.2', 'c38daa0cbe264fc621dc3bb05933b0b3')
+    version('3.8.1', '172a8c588adca12308c2aca16608d7f4')
+
+    depends_on("python @2.6:2.7.999")
+    depends_on("py-docutils", type="build")
+
+    def install(self, spec, prefix):
+        make('PREFIX=%s' % prefix, 'install')