Added the initial version of the 'zoltan' package.

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

+from spack import *
+
+class Zoltan(Package):
+    """The Zoltan library is a toolkit of parallel combinatorial algorithms for
+       parallel, unstructured, and/or adaptive scientific applications.  Zoltan's
+       largest component is a suite of dynamic load-balancing and paritioning
+       algorithms that increase applications' parallel performance by reducing
+       idle time.  Zoltan also has graph coloring and graph ordering algorithms,
+       which are useful in task schedulers and parallel preconditioners."""
+
+    homepage = "http://www.cs.sandia.gov/zoltan"
+    base_url = "http://www.cs.sandia.gov/~kddevin/Zoltan_Distributions"
+
+    version('3.83', '1ff1bc93f91e12f2c533ddb01f2c095f')
+    version('3.3', '5eb8f00bda634b25ceefa0122bd18d65')
+
+    variant('fortran', default=True, description='Enable Fortran support')
+    variant('mpi', default=False, description='Enable MPI support')
+
+    depends_on('mpi', when='+mpi')
+
+    def install(self, spec, prefix):
+        config_args = [
+            '--enable-f90interface' if '+fortan' in spec else '--disable-f90interface',
+            '--enable-mpi' if '+mpi' in spec else '--disable-mpi',
+        ]
+
+        if '+mpi' in spec:
+            config_args.append('--with-mpi=%s' % spec['mpi'].prefix)
+            config_args.append('--with-mpi-compilers=%s' % spec['mpi'].prefix.bin)
+
+        # NOTE: Early versions of Zoltan come packaged with a few embedded
+        # library packages (e.g. ParMETIS, Scotch), which messes with Spack's
+        # ability to descend directly into the package's source directory.
+        if spec.satisfies('@:3.3'):
+            cd('Zoltan_v%s' % self.version)
+
+        mkdirp('build')
+        cd('build')
+
+        config_zoltan = Executable('../configure')
+        config_zoltan('--prefix=%s' % pwd(), *config_args)
+
+        make()
+        make('install')
+
+        mkdirp(prefix)
+        move('include', prefix)
+        move('lib', prefix)
+
+    def url_for_version(self, version):
+        return '%s/zoltan_distrib_v%s.tar.gz' % (Zoltan.base_url, version)